getting error Cannot modify header information - headers already [duplicate] - php

This question already has answers here:
How to fix "Headers already sent" error in PHP
(11 answers)
Closed 2 years ago.
I am creating a project on the school management system using PHP and I am stuck as it's giving me an error: Cannot modify header information - headers already sent.
If the user forgot to fill any field and click on the submit button,the server should return a message like fill this field but instead it's giving this error and I don't know why.
this is the error I am getting
this is my form
This is my home page
<?php
session_start();
require_once 'header.php';
if(!isset($_SESSION['name']))
{
die("Access Denied");
}
if(isset($_POST['logout']))
{
header('Location: logout.php');
return;
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css"
integrity="sha384-AYmEC3Yw5cVb3ZcuHtOA93w35dYTsvhLPVnYs9eStHfGJvOvKxVfELGroGkvsg+p" crossorigin="anonymous"/>
<link href="https://fonts.googleapis.com/css2?family=Poppins:wght#400;500&display=swap" rel="stylesheet">
<link href="https://fonts.googleapis.com/css2?family=Roboto:wght#300;400;500&display=swap" rel="stylesheet">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chart.js#2.8.0"></script>
<link rel="stylesheet" href="style.css">
<link rel="stylesheet" href="../management/dashboard/css/admin.css">
<link rel="stylesheet" href="../management/student/css/addstudent.css">
<link rel="stylesheet" href="../management/student/css/allstudent.css">
<link rel="stylesheet" href="../management/student/css/studentdetail.css">
</head>
<body>
<header>
<nav>
<div class="logo">
<div class="img">
<img src="./images/logo3.png" alt="">
</div>
</div>
<ul class="nav-links">
<li id="n-1">
<div class="admin">
<p>Konark Shivam</p>
<i class="fas fa-user-circle"></i>
</div>
</li>
<li id="n-2">
<i class="fas fa-envelope"></i>
</li>
<li id="n-3">
<i class="fas fa-bell"></i>
</li>
<li id="n-4">
<i class="fas fa-sign-out-alt"></i>
</li>
</ul>
<div class="burger" id="burger">
<i class="fas fa-bars"></i>
</div>
</nav>
</header>
<!-- for logout -->
<section>
<div class="logout-box" id="logout-box">
<div class="logout-content">
<p>Do you want to logout</p>
<form method="post">
<div class="logout-button">
<input type="submit" name="logout" value="Logout">
<input type="submit" name="cancel" value="Cancel" id="logout-cancel" onclick="return false">
</div>
</form>
</div>
</div>
</section>
<menu>
<div class="left-menu" id="left-menu">
<ul>
<li class="menu-items" id="menu-item-1">
Dashboard
<span class="arrow">></span>
</li >
<div class="drop-menu" id="drop-menu-1">
<ul>
<li class="drop-items">
<div class="name"></div>
<a id="d-i-admin" href="home.php?page=dashboard/admin">> Admin</a>
</li>
<li class="drop-items">
<div class="name"></div>
> Teacher
</li>
<li class="drop-items">
<div class="name"></div>
> Students
</li>
<li class="drop-items">
<div class="name"></div>
> Parents
</li>
</ul>
</div>
<li class="menu-items" id="menu-item-2">
<span>Student</span>
<span class="arrow">></span>
</li>
<div class="drop-menu" id="drop-menu-2">
<ul>
<li class="drop-items">
<div class="name"></div>
> All Students
</li>
<li class="drop-items">
<div class="name"></div>
> Student Details
</li>
<li class="drop-items">
<div class="name"></div>
> Admission Form
</li>
<li class="drop-items">
<div class="name"></div>
> Student Promotion
</li>
</ul>
</div>
<li class="menu-items" id="menu-item3">
<span>Teacher</span>
<span class="arrow">></span>
</li>
<div class="drop-menu" id="drop-menu-3">
<ul>
<li class="drop-items">
<div class="name"></div>
> Admin
</li>
<li class="drop-items">
<div class="name"></div>
> Teacher
</li>
<li class="drop-items">
<div class="name"></div>
> Students
</li>
<li class="drop-items">
<div class="name"></div>
> Parents
</li>
</ul>
</div>
<li class="menu-items">
<span>Parents</span>
<span class="arrow">></span>
</li>
<li class="menu-items">
<span>Library</span>
<span class="arrow">></span>
</li>
<li class="menu-items">
<span>Subjects</span>
<span class="arrow">></span>
</li>
<li class="menu-items">
<span>Class Routines</span>
<span class="arrow">></span>
</li>
<li class="menu-items">
<span>Attendence</span>
<span class="arrow">></span>
</li>
<li class="menu-items">
<span>Exams</span>
<span class="arrow">></span>
</li>
<li class="menu-items">
<span>Transport</span>
<span class="arrow">></span>
</li>
<li class="menu-items">
<span>Hostel</span>
<span class="arrow">></span>
</li>
<li class="menu-items">
<span>Notice</span>
<span class="arrow">></span>
</li>
<li class="menu-items">
<span>Message</span>
<span class="arrow">></span>
</li>
<li class="menu-items">
<span>Accounts</span>
<span class="arrow">></span>
</li>
</ul>
</div>
</menu>
<main>
<div class="presentation">
<div class="my-container" id="container">
<?php
if(isset($_GET['page']))
{
$page=$_GET['page'];
include_once $page.'.php';
}
else{
include_once 'dashboard/admin.php';
}
?>
</div>
</div>
</main>
<script src="script.js"></script>
</body>
</html>
this is my addstudent page
<?php
ob_start();
if(!isset($_SESSION['name']))
{
die("Access Denied");
}
require_once 'pdo.php';
if(isset($_POST['submit']))
{
if(isset($_POST['f_name']) && isset($_POST['l_name']) && isset($_POST['gender']) && isset($_POST['dob']) && isset($_POST['blood'])
&& isset($_POST['religion']) && isset($_POST['email']) && isset($_POST['address']) && isset($_POST['phone']) )
{
if(strlen($_POST['f_name'])<1)
{
$_SESSION['error']='Please enter first name';
header('Location:home.php?page=student/addstudent');
return;
}
if(strlen($_POST['l_name'])<1)
{
$_SESSION['error']='Please enter last name';
header('Location:addstudent.php');
return;
}
if(strlen($_POST['gender'])<1)
{
$_SESSION['error']='Please enter gender';
header('Location:addstudent.php');
return;
}
if(strlen($_POST['dob'])<1)
{
$_SESSION['error']='Please select date';
header('Location:addstudent.php');
return;
}
if(strlen($_POST['blood'])<1)
{
$_SESSION['error']='Please enter blood group';
header('Location:addstudent.php');
return;
}
if(strlen($_POST['religion'])<1)
{
$_SESSION['error']='Please enter religion';
header('Location:addstudent.php');
return;
}
if(strlen($_POST['email'])<1)
{
$_SESSION['error']='Please enter email';
header('Location:addstudent.php');
return;
}
else if(!strpos($_POST['email'],"#")>0)
{
$_SESSION['error']='Please enter valid email';
header('Location:addstudent.php');
return;
}
if(strlen($_POST['address'])<1)
{
$_SESSION['error']='Please Address';
header('Location:addstudent.php');
return;
}
if(is_numeric($_POST['phone'])!=1)
{
$_SESSION['error']='Please enter valid phone no';
header('Location:addstudent.php');
return;
}
else
{
$stmpt=$pdo->prepare('INSERT INTO student_detail (f_name ,l_name ,gender, dob, blood_grp, religion, email, phone, address)
VALUES ( :fn , :ln , :sx , :dob , :bld , :re , :em , :phno , :add )');
$stmpt->execute(array(
':fn'=>$_POST['f_name'],
':ln'=>$_POST['l_name'],
':sx'=>$_POST['gender'],
':dob'=>$_POST['dob'],
':bld'=>$_POST['blood'],
':re'=>$_POST['religion'],
':em'=>$_POST['email'],
':phno'=>$_POST['phone'],
':add'=>$_POST['address']
));
$_SESSION['success']='Profile added';
header("Location: addstudent.php");
return;
}
}
}
ob_end_flush();
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="../student/css/addstudent.css">
</head>
<body>
<div class="container-student-3">
<div class="page-info">
<h3>Student Form</h3>
<p>Home>Student Admit form</p>
</div>
<div class="server-message">
<?php
if(isset($_SESSION['error']))
{
echo '<p style="color:red";>'.$_SESSION['error'].'</p>';
unset($_SESSION['error']);
}
if(isset($_SESSION['success']))
{
echo '<p style="color:green";>'.$_SESSION['success'].'</p>';
unset($_SESSION['success']);
}
?>
</div>
<div class="student-form-wrap">
<div class="student-form-content">
<h3>Add New Student</h3>
<form method="post">
<div class="form-inputs">
<div class="col-xl-3 col-lg-6 col-12 form-group">
<label>First Name *</label>
<input type="text" placeholder="First Name" name="f_name" class="form-control">
</div>
<div class="col-xl-3 col-lg-6 col-12 form-group">
<label>Last Name *</label>
<input type="text" placeholder="Last Name" name="l_name" class="form-control">
</div>
<div class="col-xl-3 col-lg-6 col-12 form-group">
<label>Gender *</label>
<input type="text" placeholder="Gender" name="gender" class="form-control">
</div>
<div class="col-xl-3 col-lg-6 col-12 form-group">
<label>Date Of Birth *</label>
<input type="date" placeholder="Date of Birth" name="dob" class="form-control">
</div>
<div class="col-xl-3 col-lg-6 col-12 form-group">
<label>Blood Group *</label>
<input type="text" placeholder="Blood Group" name="blood" class="form-control">
</div>
<div class="col-xl-3 col-lg-6 col-12 form-group">
<label>Religion *</label>
<input type="text" placeholder="Religion" name="religion" class="form-control">
</div>
<div class="col-xl-3 col-lg-6 col-12 form-group">
<label>E-Mail *</label>
<input type="text" placeholder="E-male" name="email" class="form-control">
</div>
<div class="col-xl-3 col-lg-6 col-12 form-group">
<label>Address *</label>
<input type="text" placeholder="Address" name="address" class="form-control">
</div>
<div class="col-xl-3 col-lg-6 col-12 form-group">
<label>Phone *</label>
<input type="text" placeholder="Phone No" name="phone" class="form-control">
</div>
<div class="col-12 form-group mg-t-8">
<input type="submit" value="submit" name="submit">
<input type="reset" value="Reset" id="reset">
</div>
</div>
</form>
</div>
</div>
</div>
</body>
</html>


This error is displayed when the "header" method is called more than once in an execution scope.
Let's see there, in your code there are several "if" conditions, without the "else if" treatment and somehow a "header" may be being executed more than once.
I would recommend doing the form treatments in a "Controller" or in another file, if you prefer. But as the top friend commented, you can test by replacing "return" with "exit".
Remember that "header" must be called before any real output is sent, either by normal HTML tags, blank lines in a file, or by PHP.

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<h2 class="section-heading">Login Form</h2>
<form class="form-horizontal" role="form" action = "login.php" method = "post">
<div class="form-group">
<label for="username" class="control-label sr-only">Email</label>
<div class="col-sm-12">
<div class="input-group">
<input type="email" class="form-control" id="username" name = "username" placeholder="Email">
<span class="input-group-addon"><i class="fa fa-envelope"></i></span>
</div>
</div>
</div>
<div class="form-group">
<label for="password" class="control-label sr-only">Password</label>
<div class="col-sm-12">
<div class="input-group">
<input type="password" class="form-control" id="password" name="password" placeholder="Password">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
</div>
</div>
</div>
<div class="form-group">
<div class="col-sm-12">
<label class="fancy-checkbox">
<input type="checkbox">
<span>Remember me</span>
</label>
</div>
</div>
<div class="form-group">
<div class="col-sm-12">
<button type="submit" class="btn btn-primary"><i class="fa fa-sign-in"></i> Sign in</button>
</div>
</div>
</form>
<br>
<p><em>Don't have an account yet?</em> <strong>Sign Up</strong>
<br>
<em>Forgot your password?</em> Recover Password</p>
<!-- END LOGIN FORM -->
</div>
</div>
<br>
<br>
<div class="row">
<div class="col-md-6">
<!-- LOGIN FORM WITH LABEL -->
<!-- END LOGIN FORM WITH LABEL -->
</div>
<div class="col-md-6">
<!-- SIMPLE FORM -->
<!-- END SIMPLE FORM -->
</div>
</div>
<br>
<br>
<!-- INLINE FORM -->
<!-- END INLINE FORM -->
</div>
</div>
</div>
</div>
<!-- END PAGE CONTENT -->
<!-- FOOTER -->
<footer>
<div class="container">
<div class="row">
<div class="col-md-4">
<!-- COLUMN 1 -->
<h3 class="sr-only">ABOUT US</h3>
<img src="assets/img/logo/repute-logo-light.png" class="logo" alt="Repute">
<p>Proactively aggregate B2B initiatives before extensive channels. Monotonectally extend interactive methods of empowerment through excellent applications. Rapidiously synergize visionary products with sticky technology.</p>
<br>
<address class="margin-bottom-30px">
<ul class="list-unstyled">
<li>Unit 5, Block B Nesfield Road
<br/> Colchester, Essex CO4 3ZL 222222</li>
<li>Phone: 01206 588 000</li>
<li>Email: sales#universalwebdesign.co.uk</li>
</ul>
</address>
<!-- END COLUMN 1 -->
</div>
<div class="col-md-4">
<!-- COLUMN 2 -->
<h3 class="footer-heading">USEFUL LINKS</h3>
<div class="row margin-bottom-30px">
<div class="col-xs-6">
<ul class="list-unstyled footer-nav">
<li>About Us</li>
<li>News</li>
<li>Community</li>
<li>Career</li>
<li>Blog</li>
</ul>
</div>
<div class="col-xs-6">
<ul class="list-unstyled footer-nav">
<li>Press Kit</li>
<li>FAQ</li>
<li>Terms</li>
<li>Privacy Policy</li>
<li>Contact Us</li>
</ul>
</div>
</div>
<!-- END COLUMN 2 -->
</div>
<div class="col-md-4">
<!-- COLUMN 3 -->
<div class="newsletter">
<h3 class="footer-heading">NEWSLETTER</h3>
<p>Get the latest update from us by subscribing to our newsletter.</p>
<form class="newsletter-form" method="POST">
<div class="input-group input-group-lg">
<input type="email" class="form-control" name="email" placeholder="youremail#domain.com">
<span class="input-group-btn"><button class="btn btn-primary" type="button"><i class="fa fa-spinner fa-spin"></i><span>SUBSCRIBE</span></button>
</span>
</div>
<div class="alert"></div>
</form>
</div>
<div class="social-connect">
<h3 class="footer-heading">GET CONNECTED</h3>
<ul class="list-inline social-icons">
<li><i class="fa fa-facebook"></i></li>
<li><i class="fa fa-twitter"></i></li>
<li><i class="fa fa-google-plus"></i></li>
<li><i class="fa fa-rss"></i></li>
</ul>
</div>
<!-- END COLUMN 3 -->
</div>
</div>
</div>
<!-- COPYRIGHT -->
<div class="text-center copyright">
©2018 Bid4MyJob. All Rights Reserved.
</div>
<!-- END COPYRIGHT -->
</footer>
<!-- END FOOTER -->
</div>
<!-- END WRAPPER -->
<!-- JAVASCRIPTS -->
<script src="assets/js/jquery-2.1.1.min.js"></script>
<script src="assets/js/bootstrap.min.js"></script>
<script src="assets/js/plugins/autohidingnavbar/jquery.bootstrap-autohidingnavbar.min.js"></script>
<script src="assets/js/repute-scripts.js"></script>
</body>
</html>

You run the query:
$sql = "SELECT customer_id FROM customer WHERE email_adress = 'a#a.com' and password = 'a'";
this returns multiple results for $count = mysqli_num_rows($result); is thus > 1.
So you always fall into the else:
if($count == 1) {
$_SESSION['login_user'] = $myusername;
header("location: index2.php");
}else {
$error = "Your Login Name or Password is invalid";
}
Try for testing purposes try:
if($count >= 1) {
$_SESSION['login_user'] = $myusername;
header("location: index2.php");
}else {
$error = "Your Login Name or Password is invalid";
}
ofc later you will have to make sure you can't sign up email addresses twice.
Secondly you might want to forward to your session.php instead?
header("location:session.php"); // instead of index2.php

How to use PHP display unique user data to a html page

currently I have a website with a basic login, I was just wondering how I would display a the name,skill and description of the unique user who is logged in.This is what I have done so far.I can only find articles on how to display data into table.This is the updated code:
<?php
include('session.php');
require 'config.php';
$sql = "SELECT * FROM profile";
$result = $conn->query($sql);
//echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";
?>
<html>
<head>
<link rel="stylesheet" type="text/css" href="profile.css">
</head>
<body>
<ul>
<li>Home</li>
<li>PostJob</li>
<li>Find Job</li>
<li>How It Works</li>
<li>Notifications</li>
<li>Message</li>
<li>profile</li>
</ul>
<h1>Welcome To Bid4MyJob</h1>
<li>edit profile</li>
<div id="ProfilePage">
<div id="LeftCol">
<div id="Photo"></div>
<div id="ProfileOptions">
a
</div>
</div>
<div id="Info">
<p>
<strong>Name:<?php echo $row["name"]?></strong>
<!--<span>James</span>-->
</p>
<p>
<strong>Skill:<?php echo $row["skill"]?><</strong>
<!--span>James</span>-->
</p>
<!-- <p>
<strong>review:<?php /*echo $row["review"]*/?><</strong>
<span>james</span>
</p> -->
<p>
<strong>Description:<?php echo $row["description"]?><</strong>
<span>James</span>
</p>
<!--<p>
<strong>Name:</strong>
<span>james</span>
</p>-->
</div>
<!-- Needed because other elements inside ProfilePage have floats
<div style="clear:both"></div>-->
</div>
</body>
</html>
Picture of database table:
https://imgur.com/a/XYTLY
Session.php:
<?php
include('config.php');
session_start();
$user_check = $_SESSION['login_user'];
$ses_sql = mysqli_query($conn,"select email_adress from customer where email_adress = '$user_check' ");
$row = mysqli_fetch_array($ses_sql,MYSQLI_ASSOC);
$login_session = $row['email_adress'];
if(!isset($_SESSION['login_user'])){
header("location:login.php");
}
?>
Login.php:
<?php
include("config.php");
session_start();
if($_SERVER["REQUEST_METHOD"] == "POST") {
// username and password sent from form
$myusername = mysqli_real_escape_string($conn,$_POST['username']);
$mypassword = mysqli_real_escape_string($conn,$_POST['password']);
$sql = "SELECT customer_id FROM customer WHERE email_adress = '$myusername' and password = '$mypassword'";
$result = mysqli_query($conn,$sql);
$row = mysqli_fetch_array($result,MYSQLI_ASSOC);
$active = $row['customer_id'];
$count = mysqli_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row
if($count == 1) {
$_SESSION['login_user'] = $myusername;
header("location: index2.php");
}else {
$error = "Your Login Name or Password is invalid";
}
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<title>Login | Bid4MyJob</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="Bid4MyJob">
<meta name="author" content="James Wood">
<!-- CSS -->
<link href="assets/css/bootstrap.css" rel="stylesheet" type="text/css">
<link href="assets/css/font-awesome.min.css" rel="stylesheet" type="text/css">
<link href="assets/css/main.css" rel="stylesheet" type="text/css">
<link href="assets/css/my-custom-styles.css" rel="stylesheet" type="text/css">
<!-- IE 9 Fallback-->
<!--[if IE 9]>
<link href="assets/css/ie.css" rel="stylesheet">
<![endif]-->
<!-- GOOGLE FONTS -->
<link href='http://fonts.googleapis.com/css?family=Open+Sans:300,400italic,400,600,700' rel='stylesheet' type='text/css'>
<link href='http://fonts.googleapis.com/css?family=Roboto+Condensed:300,300italic,400italic,700,400,300' rel='stylesheet' type='text/css'>
<!-- FAVICONS -->
<link rel="apple-touch-icon-precomposed" sizes="144x144" href="assets/ico/repute144x144.png">
<link rel="apple-touch-icon-precomposed" sizes="114x114" href="assets/ico/repute114x114.png">
<link rel="apple-touch-icon-precomposed" sizes="72x72" href="assets/ico/repute72x72.png">
<link rel="apple-touch-icon-precomposed" href="assets/ico/repute57x57.png">
<link rel="shortcut icon" href="assets/ico/favicon.png">
</head>
<body>
<!-- WRAPPER -->
<div class="wrapper">
<!-- NAVBAR -->
<nav class="navbar navbar-default " role="navigation">
<div class="container">
<!-- TOPBAR -->
<div class="topbar">
<ul class="list-inline top-nav">
<li>
<div class="btn-group">
<button type="button" class="btn btn-link dropdown-toggle btn-xs" data-toggle="dropdown"><img src="assets/img/flags/United-Kingdom.png" alt="United Kingdom"> United Kingdom <span class="caret"></span></button>
<ul class="dropdown-menu dropdown-menu-right country-selector" role="menu">
<li>
<img src="assets/img/flags/United-Kingdom.png" alt="United Kingdom"> United Kingdom
</li>
<li>
<img src="assets/img/flags/Japan.png" alt="Japan"> Japan
</li>
<li>
<img src="assets/img/flags/China.png" alt="China"> China
</li>
<li>
<img src="assets/img/flags/Germany.png" alt="Germany"> Germany
</li>
</ul>
</div>
</li>
<li>Help</li>
<li>Support</li>
</ul>
<div class="searchbox">
<form method="post">
<div class="input-group input-group-sm">
<input type="text" class="form-control" placeholder="search ...">
<span class="input-group-btn">
<button class="btn btn-default" type="button"><i class="fa fa-search"></i></button>
</span>
</div>
</form>
</div>
</div>
<!-- END TOPBAR -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#main-nav">
<span class="sr-only">Toggle Navigation</span>
<i class="fa fa-bars"></i>
</button>
<a href="index.html" class="navbar-brand navbar-logo navbar-logo-bigger">
</a>
</div>
<!-- MAIN NAVIGATION -->
<div id="main-nav" class="navbar-collapse collapse">
<ul class="nav navbar-nav navbar-right">
<li>
HOME
</li>
<li>
HOW IT WORKS
</li>
<li>
POST JOB
</li>
<li>
FIND JOB
</li>
<li>
SIGN UP
</li>
<li>
LOGIN
</li>
</ul>
</div>
<!-- END MAIN NAVIGATION -->
</div>
</nav>
<!-- END NAVBAR -->
<!-- BREADCRUMBS -->
<div class="page-header">
<div class="container">
<h1 class="page-title pull-left">Login</h1>
<ol class="breadcrumb">
<li>Home</li>
<li class="active">Login</li>
</ol>
</div>
</div>
<!-- END BREADCRUMBS -->
<!-- PAGE CONTENT -->
<div class="page-content">
<div class="col-md-6">
<!-- LOGIN FORM -->
<h2 class="section-heading">Login Form</h2>
<form class="form-horizontal" role="form" action = "" method = "post">
<div class="form-group">
<label for="username" class="control-label sr-only">Email</label>
<div class="col-sm-12">
<div class="input-group">
<input type="email" class="form-control" id="username" name = "username" placeholder="Email">
<span class="input-group-addon"><i class="fa fa-envelope"></i></span>
</div>
</div>
</div>
<div class="form-group">
<label for="password" class="control-label sr-only">Password</label>
<div class="col-sm-12">
<div class="input-group">
<input type="password" class="form-control" id="password" name="password" placeholder="Password">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
</div>
</div>
</div>
<div class="form-group">
<div class="col-sm-12">
<label class="fancy-checkbox">
<input type="checkbox">
<span>Remember me</span>
</label>
</div>
</div>
<div class="form-group">
<div class="col-sm-12">
<button type="submit" class="btn btn-primary"><i class="fa fa-sign-in"></i> Sign in</button>
</div>
</div>
</form>
<br>
<p><em>Don't have an account yet?</em> <strong>Sign Up</strong>
<br>
<em>Forgot your password?</em> Recover Password</p>
<!-- END LOGIN FORM -->
</div>
</div>
<br>
<br>
<div class="row">
<div class="col-md-6">
<!-- LOGIN FORM WITH LABEL -->
<!-- END LOGIN FORM WITH LABEL -->
</div>
<div class="col-md-6">
<!-- SIMPLE FORM -->
<!-- END SIMPLE FORM -->
</div>
</div>
<br>
<br>
<!-- INLINE FORM -->
<!-- END INLINE FORM -->
</div>
</div>
</div>
</div>
<!-- END PAGE CONTENT -->
<!-- FOOTER -->
<footer>
<div class="container">
<div class="row">
<div class="col-md-4">
<!-- COLUMN 1 -->
<h3 class="sr-only">ABOUT US</h3>
<img src="assets/img/logo/repute-logo-light.png" class="logo" alt="Repute">
<p>Proactively aggregate B2B initiatives before extensive channels. Monotonectally extend interactive methods of empowerment through excellent applications. Rapidiously synergize visionary products with sticky technology.</p>
<br>
<address class="margin-bottom-30px">
<ul class="list-unstyled">
<li>Unit 5, Block B Nesfield Road
<br/> Colchester, Essex CO4 3ZL 222222</li>
<li>Phone: 01206 588 000</li>
<li>Email: sales#universalwebdesign.co.uk</li>
</ul>
</address>
<!-- END COLUMN 1 -->
</div>
<div class="col-md-4">
<!-- COLUMN 2 -->
<h3 class="footer-heading">USEFUL LINKS</h3>
<div class="row margin-bottom-30px">
<div class="col-xs-6">
<ul class="list-unstyled footer-nav">
<li>About Us</li>
<li>News</li>
<li>Community</li>
<li>Career</li>
<li>Blog</li>
</ul>
</div>
<div class="col-xs-6">
<ul class="list-unstyled footer-nav">
<li>Press Kit</li>
<li>FAQ</li>
<li>Terms</li>
<li>Privacy Policy</li>
<li>Contact Us</li>
</ul>
</div>
</div>
<!-- END COLUMN 2 -->
</div>
<div class="col-md-4">
<!-- COLUMN 3 -->
<div class="newsletter">
<h3 class="footer-heading">NEWSLETTER</h3>
<p>Get the latest update from us by subscribing to our newsletter.</p>
<form class="newsletter-form" method="POST">
<div class="input-group input-group-lg">
<input type="email" class="form-control" name="email" placeholder="youremail#domain.com">
<span class="input-group-btn"><button class="btn btn-primary" type="button"><i class="fa fa-spinner fa-spin"></i><span>SUBSCRIBE</span></button>
</span>
</div>
<div class="alert"></div>
</form>
</div>
<div class="social-connect">
<h3 class="footer-heading">GET CONNECTED</h3>
<ul class="list-inline social-icons">
<li><i class="fa fa-facebook"></i></li>
<li><i class="fa fa-twitter"></i></li>
<li><i class="fa fa-google-plus"></i></li>
<li><i class="fa fa-rss"></i></li>
</ul>
</div>
<!-- END COLUMN 3 -->
</div>
</div>
</div>
<!-- COPYRIGHT -->
<div class="text-center copyright">
©2018 Bid4MyJob. All Rights Reserved.
</div>
<!-- END COPYRIGHT -->
</footer>
<!-- END FOOTER -->
</div>
<!-- END WRAPPER -->
<!-- JAVASCRIPTS -->
<script src="assets/js/jquery-2.1.1.min.js"></script>
<script src="assets/js/bootstrap.min.js"></script>
<script src="assets/js/plugins/autohidingnavbar/jquery.bootstrap-autohidingnavbar.min.js"></script>
<script src="assets/js/repute-scripts.js"></script>
</body>
</html>

You need a field on Profile that links to the customer table (or viceversa).
email can be in both tables, then you can link to your $login_session
SELECT * FROM profile WHERE email = '$login_session' LIMIT 1
In this case, take care and do not let users to change their email (without verification they own it) and do not let create a new account with the same credentials as another one.
But as a good practice on DB, it is better to have profile_id on customer
session.php
$ses_sql = mysqli_query($conn,"select email_adress, profile_id from customer where email_adress = '$user_check' ");
index.php
$sql = "SELECT * FROM profile WHERE profile_id = $profile_id LIMIT 1";
BTW:
- Try to separate concerns, between database and presentation layer. You should read more about MVC.

PHP login redirect results in headers already sent [duplicate]

This question already has answers here:
How to fix "Headers already sent" error in PHP
(11 answers)
Closed 6 years ago.
I'm trying to create a login script, which generates a session after the user signed in, now the user would be redirected to a new url, sadly I receive the following error:
[Fri Sep 23 20:09:17.125738 2016] [fcgid:warn] [pid 27802] [client 91.97.73.183:12550] mod_fcgid: stderr: PHP Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/pr0b.com/httpdocs/index.php:109) in /var/www/vhosts/pr0b.com/httpdocs/handling/classes/user_login_class.php on line 74, referer: http://pr0b.com/
My code looks like the following:
Index.php
<?php
require_once('handling/classes/database_class.php');
require_once('handling/classes/site_config_class.php');
require_once('handling/classes/main_class.php');
$site_config = new site_config_class();
$site_informations = new main_class();
$site_informations_response = $site_informations->class_handler();
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title><?php echo $site_config->site_title_home; ?></title>
<!-- Global stylesheets -->
<link href="https://fonts.googleapis.com/css?family=Roboto:400,300,100,500,700,900" rel="stylesheet" type="text/css">
<link href="assets/css/icons/icomoon/styles.css" rel="stylesheet" type="text/css">
<link href="assets/css/bootstrap.css" rel="stylesheet" type="text/css">
<link href="assets/css/core.css" rel="stylesheet" type="text/css">
<link href="assets/css/components.css" rel="stylesheet" type="text/css">
<link href="assets/css/colors.css" rel="stylesheet" type="text/css">
<link href="assets/css/stylesheet.css" rel="stylesheet" type="text/css">
<!-- Core JS files -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script type="text/javascript" src="assets/js/core/libraries/bootstrap.min.js"></script>
<script type="text/javascript" src="assets/js/plugins/ui/nicescroll.min.js"></script>
<script type="text/javascript" src="assets/js/plugins/ui/drilldown.js"></script>
<script type="text/javascript" src="assets/js/pages/form_select2.js"></script>
<script type="text/javascript" src="assets/js/core/app.js"></script>
<script type="text/javascript" src="assets/js/plugins/forms/selects/select2.min.js"></script>
<script type="text/javascript" src="../assets/js/plugins/notifications/noty.min.js"></script>
</head>
<body class="navbar-top-md-md login-container">
<div class="navbar-fixed-top">
<div class="navbar navbar-inverse">
<div class="navbar-header">
<a class="navbar-brand" href="index.html"><div class="logo"></div></a>
<ul class="nav navbar-nav pull-right visible-xs-block">
<li><a data-toggle="collapse" data-target="#navbar-mobile"><i class="icon-tree5"></i></a></li>
</ul>
</div>
<div class="navbar-collapse collapse" id="navbar-mobile">
<ul class="nav navbar-nav navbar-right">
<li><a data-toggle="modal" data-target="#modal-registration"><i class="icon-users4 position-left"></i> Register Account</a></li>
<li><a data-toggle="modal" data-target="#modal-login"><i class="icon-user-lock position-left"></i> Log In</a></li>
<li><a data-toggle="modal" data-target="#modal-recover"><i class="icon-reply position-left"></i> Resend Credentials</a></li>
</ul>
</div>
</div>
<!-- /main navbar -->
<!-- Second navbar -->
<div class="navbar navbar-default" id="navbar-second">
<ul class="nav navbar-nav no-border visible-xs-block">
<li><a class="text-center collapsed" data-toggle="collapse" data-target="#navbar-second-toggle"><i class="icon-menu7"></i></a></li>
</ul>
<div class="navbar-collapse collapse" id="navbar-second-toggle">
<ul class="nav navbar-nav">
<li class="active"><i class="icon-home position-left"></i> Home</li>
<li><i class="icon-heart6 position-left"></i> Community</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><i class="icon-facebook2"></i></li>
<li><i class="icon-twitter"></i></li>
<li><i class="icon-youtube"></i></li>
</ul>
</div>
</div>
<!-- /second navbar -->
</div>
<!-- /fixed navbars wrapper -->
<!-- Page container -->
<div class="page-container">
<div class="page-content">
<div class="content-wrapper">
<div class="row">
<div class="col-lg-3">
<div class="panel bg-slate-400">
<div class="panel-body">
<div class="heading-elements">
<span class="heading-text badge bg-slate-300">Registered users</span>
</div>
<h3 class="no-margin"><?php echo $site_informations_response['registered_users']; ?></h3>
Registered users
</div>
</div>
</div>
<div class="col-lg-3">
<div class="panel bg-slate-400">
<div class="panel-body">
<div class="heading-elements">
<span class="heading-text badge bg-slate-300">Online users</span>
</div>
<h3 class="no-margin"><?php echo $site_informations_response['online_users']; ?></h3>
Online users
</div>
</div>
</div>
<div class="col-lg-3">
<div class="panel bg-slate-400">
<div class="panel-body">
<div class="heading-elements">
<span class="heading-text badge bg-slate-300">Male users</span>
</div>
<h3 class="no-margin"><?php echo $site_informations_response['male_users']; ?></h3>
Male users
</div>
</div>
</div>
<div class="col-lg-3">
<div class="panel bg-slate-400">
<div class="panel-body">
<div class="heading-elements">
<span class="heading-text badge bg-slate-300">Female users</span>
</div>
<h3 class="no-margin"><?php echo $site_informations_response['female_users']; ?></h3>
Female users
</div>
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
Content
</div>
</div>
<!-- Login form -->
<div id="modal-login" class="modal fade">
<div class="modal-dialog">
<div class="modal-content login-form">
<!-- Form -->
<form class="modal-body" method="post">
<div class="text-center">
<div class="icon-object border-slate-300 text-slate-300"><i class="icon-reading"></i></div>
<h5 class="content-group">Login to your account <small class="display-block">Your credentials</small></h5>
</div>
<div class="form-group has-feedback has-feedback-left">
<input type="text" class="form-control" placeholder="Username" name="username">
<div class="form-control-feedback">
<i class="icon-user text-muted"></i>
</div>
</div>
<div class="form-group has-feedback has-feedback-left">
<input type="text" class="form-control" placeholder="Password" name="password">
<div class="form-control-feedback">
<i class="icon-lock2 text-muted"></i>
</div>
</div>
<input type="hidden" name="action" value="login">
<div class="form-group">
<button type="submit" class="btn bg-slate-600 btn-block">Login</button>
<button type="button" class="btn btn-default btn-block" data-dismiss="modal">Cancel</button>
</div>
<span class="help-block text-center no-margin">By continuing, you're confirming that you've read our Terms & Conditions and Cookie Policy</span>
</form>
<!-- /form -->
</div>
</div>
</div>
<!-- /login form -->
<!-- Registration form -->
<div id="modal-registration" class="modal fade">
<div class="modal-dialog">
<div class="modal-content login-form">
<!-- Form -->
<form class="modal-body" method="post">
<div class="text-center">
<div class="icon-object border-slate-300 text-slate-300"><i class="icon-plus3"></i></div>
<h5 class="content-group">Create account <small class="display-block">All fields are required</small></h5>
</div>
<div class="content-divider text-muted form-group"><span>Your credentials</span></div>
<div class="form-group has-feedback has-feedback-left">
<input type="text" class="form-control" placeholder="Username" name="username">
<div class="form-control-feedback">
<i class="icon-user-check text-muted"></i>
</div>
</div>
<div class="form-group has-feedback has-feedback-left">
<input id="password" type="password" class="form-control" placeholder="Password" name="password">
<div class="form-control-feedback">
<i class="icon-user-lock text-muted"></i>
</div>
</div>
<div class="form-group has-feedback has-feedback-left">
<input id="password_confirm" type="password" class="form-control" placeholder="Repeat password" name="password_confirm">
<div class="form-control-feedback">
<i class="icon-user-lock text-muted"></i>
</div>
</div>
<div class="form-group">
<span id="password_status" class="help-block text-center no-margin"></span>
</div>
<div class="content-divider text-muted form-group"><span>Your privacy</span></div>
<div class="form-group has-feedback has-feedback-left">
<input type="text" class="form-control" placeholder="Email" name="email">
<div class="form-control-feedback">
<i class="icon-mention text-muted"></i>
</div>
</div>
<div class="form-group has-feedback has-feedback-left">
<input type="text" class="form-control" placeholder="Reset pin code" name="pin_code">
<div class="form-control-feedback">
<i class="icon-sync text-muted"></i>
</div>
</div>
<div class="form-group">
<select data-placeholder="Select a gender..." class="select" name="gender">
<option></option>
<option value="male">Male</option>
<option value="female">Female</option>
</select>
</div>
<div class="content-divider text-muted form-group"><span>Additions</span></div>
<div class="form-group">
<div class="checkbox">
<label>
<input type="checkbox" id="terms" class="styled" name="terms">Accept terms of service
</label>
</div>
</div>
<input type="hidden" name="action" value="register">
<div class="form-group">
<button id="registerButton" type="submit" class="btn bg-slate-600 btn-block" disabled>Register account</button>
<button type="button" class="btn btn-default btn-block" data-dismiss="modal">Cancel</button>
</div>
<span class="help-block text-center no-margin">By continuing, you're confirming that you've read our Terms & Conditions and Cookie Policy</span>
</form>
<!-- /form -->
</div>
</div>
</div>
<script type="text/javascript">
$(document).ready(function() {
$("#password_confirm").keyup(validate);
});
$('#terms').change(function(){
$("#registerButton").prop('disabled', !$(this).is(':checked'));
});
function validate() {
var password1 = $("#password").val();
var password2 = $("#password_confirm").val();
if(password1 == password2) {
$("#password_status").text("Passwords match!");
}
else {
$("#password_status").text("Passwords do not match!");
}
}
</script>
<!-- /registration form -->
<!-- Password recovery form -->
<div id="modal-recover" class="modal fade">
<div class="modal-dialog">
<div class="modal-content login-form">
<!-- Form -->
<form class="modal-body" action="index.html">
<div class="text-center">
<div class="icon-object border-slate-300 text-slate-300"><i class="icon-spinner11"></i></div>
<h5 class="content-group">Password recovery <small class="display-block">We'll send you instructions in email</small></h5>
</div>
<div class="form-group has-feedback has-feedback-left">
<input type="text" class="form-control" placeholder="Username">
<div class="form-control-feedback">
<i class="icon-user-check text-muted"></i>
</div>
</div>
<div class="form-group has-feedback has-feedback-left">
<input type="text" class="form-control" placeholder="Reset pin code">
<div class="form-control-feedback">
<i class="icon-sync text-muted"></i>
</div>
</div>
<input type="hidden" name="action" value="recover">
<button type="submit" class="btn bg-slate-600 btn-block">Reset password</button>
<button type="button" class="btn btn-default btn-block" data-dismiss="modal">Cancel</button>
</form>
<!-- /form -->
</div>
</div>
</div>
<!-- /password recovery form -->
<?php
if(!empty($_POST)){
$action = $_POST['action'];
switch ($action) {
case 'login':
require_once('handling/classes/user_login_class.php');
$user_login = new user_login_class($_POST['username'], $_POST['password']);
$user_login_response = $user_login->class_handler();
echo $user_login_response;
break;
case 'register':
require_once('handling/classes/register_class.php');
$register_account = new register_class($_POST['username'], $_POST['password'], $_POST['password_confirm'], $_POST['email'], $_POST['pin_code'], $_POST['gender']);
$register_account_response = $register_account->class_handler();
echo $register_account_response;
break;
case 'recover':
#code
break;
}
}
?>
</div>
</div>
</div>
<!-- /Page container -->
<!-- Footer -->
<div class="footer text-muted text-center">
<?php echo $site_config->site_footer; ?>
</div>
<!-- /footer -->
</body>
</html>
user_login_class
<?php
class user_login_class extends database_class {
// Class constructor
function __construct($username, $password) {
$this->username = $username;
$this->password = $password;
$this->salt = 'zWorlDs4lt';
$this->hashed_password = md5($this->salt.$this->password);
}
// Function to check the user credentials
function check_user_credentials() {
$this->connect();
$result = $this->execute_query("SELECT password FROM Users WHERE username = '" . $this->username . "'");
while($row = mysqli_fetch_assoc($result)) {
$response = $row['password'];
}
if($response !== $this->hashed_password) {
return false;
}else {
return true;
}
}
// Function to check the account status
function get_account_status() {
$this->connect();
$result = $this->execute_query("SELECT status FROM Users WHERE username = '" . $this->username . "'");
while($row = mysqli_fetch_assoc($result)) {
$response = $row['status'];
}
return $response;
}
// Function to update user informations
function update_user_variables() {
$this->connect();
$result = $this->execute_query("UPDATE Users SET ip = '" . $_SERVER['REMOTE_ADDR'] . "', online = '1' WHERE username = '" . $this->username . "'");
if(!$result) {
return false;
}else {
return true;
}
}
// Function to execute the class
function class_handler() {
if(!$this->username) {
return 'Error: Username is required. Please enter a valid username.';
}else if(!$this->password) {
return 'Error: Password is required. Please enter a valid password.';
}else {
$check_account_status = $this->get_account_status();
if($check_account_status == 1) {
return 'Error: This account was banned. Please contact our support.';
}else {
$check_user_credentials_resonse = $this->check_user_credentials();
if($check_user_credentials_resonse == false) {
return 'Error: Wrong credentials. Please try again.';
}else if($check_user_credentials_resonse == true) {
$update_user = $this->update_user_variables();
if($update_user == false) {
return 'Error: Wrong credentials. Please try again.';
}else if($update_user == true) {
session_start();
$_SESSION['logged_in'] = true;
$_SESSION['username'] = $this->username;
header('Location: /zworld');
exit();
}
}
}
}
}
}
?>
But yea, it would not redirect the user, does anyone know why? I would appreciate any kind of help, cause I have no clue where to search.

at the very top of your script, put ob_start()
<?php
ob_start();
require_once('handling/classes/database_class.php');
require_once('handling/classes/site_config_class.php');
require_once('handling/classes/main_class.php');
$site_config = new site_config_class();
$site_informations = new main_class();
$site_informations_response = $site_informations->class_handler();
...
?>

php & mysql form data not been inserted in database

I am trying to insert my form data into mysql, but when I enter the details and submit it, I am not able to get the data in database. May I know where am I wrong?
<?php
// Same as error_reporting(E_ALL);
ini_set('error_reporting', E_ALL);
// Report all PHP errors (see changelog)
error_reporting(E_ALL);
echo "jgj"
$servername = "localhost";
$username = "username";
$password = "";
$dbname = "sudhar";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
else
{
echo "connected"
}
if(isset($_POST['submit']))
{
$Firstname=mysqli_real_escape_string($conn,$_POST['Firstname']);
$Lastname=mysqli_real_escape_string($conn,$_POST['Lastname']);
$Username=mysqli_real_escape_string($conn,$_POST['Username']);
$email=mysqli_real_escape_string($conn,$_POST['email']);
$Password=mysqli_real_escape_string($conn,$_POST['Password']);
$sql="insert into useraccount(Firstname,Lastname,Username,email,Password)values('$Firstname','$Lastname','$Username','$Password','$email')";
$result=mysqli_query($conn,$sql)
echo "data inserted"
or die(mysql_error());
}
?>
html,body
{
margin:0px;
height:100%;
}
.carousel-inner > .item > img,
.carousel-inner > .item > a > img {
width: 60%;
margin: auto;
}
.content
{
width:100%;
height:400px;
}
.signup
{
height:500px;
}
.footer
{
position:relative;
background-color:black;
}
<!DOCTYPE html>
<html lang="en">
<head>
<title>ASK</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" type="text/css" href="boot.css">
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="jumbotron">
<div class="container">
<div class="row">
<div class="col-md-6">
<h1>school name</h1>
</div>
<div class="col-md-6">
<img src="../project/photo/l.png" height="150px"/>
</div>
</div>
</div>
</div>
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#mynavbar">schoolName</a>
</div>
<div class="collapse navbar-collapse" id="myNavbar">
<ul class="nav navbar-nav">
<li class="active">Home</li>
<li><a href="about.html" target=_self>About Us</a></li>
<li><a href="infra.html" target=_self>Infrastructure</a></li>
<li class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown" href="">Administration<span class="caret"></span></a>
<ul class="dropdown-menu">
<li>staff login</li>
<li>staff details</li>
<li>class handling</li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><span class="glyphicon glyphicon-user"></span> Sign Up</li>
<li><span class="glyphicon glyphicon-log-in"></span> Login</li>
</ul>
</div>
</div>
</nav>
<div class="container">
<div class="signup">
<form method="post" class="form-horizontal" action="user.php">
<div class="form-group">
<div class="col-xs-3">
<label for="Firstname">Firstname:</label>
<input type="text" name="Firstname" class="form-control" id="fnmae" placeholder="Enter Firstname">
</div></div>
<div class="form-group">
<div class="col-xs-3">
<label for="Lastname">Lastname:</label>
<input type="text" name="Lastname" class="form-control" id="lnmae" placeholder="Enter Lastname">
</div></div>
<div class="form-group">
<div class="col-xs-3">
<label for="Username">Username:</label>
<input type="text" name="Username" class="form-control" id="unmae" placeholder="Enter Username">
</div></div>
<div class="form-group">
<div class="col-xs-3">
<label for="email">Email:</label>
<input type="email" name="email" class="form-control" id="email" placeholder="Enter email">
</div></div>
<div class="form-group">
<div class="col-xs-3">
<label for="pwd">Password:</label>
<input type="Password" name="Password" class="form-control" id="pwd" placeholder="Enter password">
</div></div>
<button type="submit" class="btn btn-default">Submit</button><br>
</form>
</div>
</div>
<div class="footer nav">
<p> Copyrights# © WWW.schools.com</p>
</div>
</body>
</html>

$query=mysqli_query($con,"insert into useraccount('Firstname','Lastname','Username','email','Password')values($Firstname,$Lastname,$Username,$email,$Password)");
and change button name

If regardless to other errors, and if you just guess how to have your query run:
There are some reserved naming convention, and maybe your code could works in some situation, put column names between quotation marks.
INSERT into useraccount
('Firstname','Lastname','Username','email','Password')
VALUES
($Firstname,$Lastname,$Username,$Password,$email);
I suggest you escape characters in variables you put into query.
This is a valuable article for you:
http://php.net/manual/en/function.mysql-real-escape-string.php
But: Do not use this solution for production, as using login credential while learning the code is the worst possible way.

change
<button type="submit" class="btn btn-default">Submit</button><br>
to
<button type="submit" name="submit class="btn btn-default">Submit</button><br>
because $_POST['submit'] is not set since you forgot to set the name

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