Signup System in PHP - php

Question

I recently started coding a website with a login/signup system with php & mysql. But when i try to make the signup it give the error, that i didn't insert the username/email. I will leave the code of the signup page and the code of the "script":
Signup page:
<?php
require 'inner.php';
?>
<?php
require 'header.php';
?>
<?php
require 'main.php';
?>
<div class="signup-header">
<center>
<h1>Signup<span>Page</span></h1>
</center>
</div>
<div class="form2">
<center>
<form class="" action="includes/signup.inc.php" method="post">
<input type="text" name="username" autocomplete="off" required>
<label for="name" class="label-name">
<span class="content-name">Username</span>
</label>
</form>
</center>
</div>
<div class="form3">
<center>
<form class="" action="includes/signup.inc.php" method="post">
<input type="text" name="email" autocomplete="off" required>
<label for="name" class="label-name">
<span class="content-name">Email</span>
</label>
</form>
</center>
</div>
<div class="form4">
<center>
<form class="" action="includes/signup.inc.php" method="post">
<input type="password" name="password" autocomplete="off" required>
<label for="name" class="label-name">
<span class="content-name">Password</span>
</label>
</form>
</center>
</div>
<div class="form5">
<center>
<form class="" action="includes/signup.inc.php" method="post">
<input type="password" name="rePassword" autocomplete="off" required>
<label for="name" class="label-name">
<span class="content-name">Repeat Password</span>
</label>
</form>
</center>
</div>
<div class="signup-btn">
<form action="includes/signup.inc.php" method="post">
<button type="text" name="signup-submit">Register</button>
</form>
</div>
<?php
require 'footer.php';
?>
Script Page:
<?php
if(isset($_POST["signup-submit"]))
{
require 'dbhandler.php';
$username = $_POST["username"];
$email = $_POST["email"];
$password = $_POST["password"];
$repeatpassword = $_POST["rePassword"];
if(empty($username) || empty($email) || empty($password) ||empty($repeatpassword))
{
header("Location: ../signup.php?error=emptyfields&username=".$username."&email=".$email);
exit();
}elseif(!filter_var($email,FILTER_VALIDATE_EMAIL)&& !preg_match("/^[a-zA-Z0-9]*$/",$username)) {
header("Location: ../signup.php?error=invalidmail&username");
exit();
}elseif (!filter_var($email,FILTER_VALIDATE_EMAIL)) {
header("Location: ../signup.php?error=invalidmail");
exit();
}elseif (!preg_match("/^[a-zA-Z0-9]*$/",$username))
{
header("Location: ../signup.php?error=invalidusername");
exit();
}
elseif($ps !== $rp) {
header("Location: ../signup.php/error=passwordcheck");
exit();
}else {
$sql = "SELECT * FROM users WHERE uidUsers=?";
$stmt = mysqli_stmt_init($connect);
if (!mysqli_stmt_prepare($stmt,$sql)) {
header("Location: ../signup.php/error=connectionerror ");
exit();
}else
{
mysqli_stmt_bind_param($stmt, "s", $email);
mysqli_stmt_execute($stmt);
mysqli_stmt_store_result($stmt);
$result_check = mysqli_stmt_num_rows();
if ($result_check > 0) {
header("Location: ../signup.php/error=usertaken ");
exit();
}else {
$sql = "INSERT INTO user(uidUsers, emailUsers, pwdUsers) VALUES (?,?,?)";
$stmt = mysqli_stmt_init($connect);
if (!mysqli_stmt_prepare($stmt,$sql)) {
header("Location: ../signup.php/error=connectionerror ");
exit();
}else {
$hash_ps = password_hash($ps,PASSWORD_DEFAULT);
mysqli_stmt_bind_param($stmt, "sss", $email,$username,$hash_ps);
mysqli_stmt_execute($stmt);
header("Location: ../signup.php/signup=success");
exit();
}
}
}
}
}
?>
It's like PHP can't find the username/mail value.

Answer 1

You need to wrap whole form inside <form> element.
In your code, you have only this little part in form, so it is not sending all of the fields you need for registration:
<form action="includes/signup.inc.php" method="post">
<button type="text" name="signup-submit">Register</button>
</form>
So it will be something like:
<form action="includes/signup.inc.php" method="post"> <!-- FORM BEGINNING HERE -->
<div class="signup-header">
<center>
<h1>Signup<span>Page</span></h1>
</center>
</div>
<div class="form2">
<center>
<form class="" action="includes/signup.inc.php" method="post">
<input type="text" name="username" autocomplete="off" required>
<label for="name" class="label-name">
<span class="content-name">Username</span>
</label>
</form>
</center>
</div>
<div class="form3">
<center>
<form class="" action="includes/signup.inc.php" method="post">
<input type="text" name="email" autocomplete="off" required>
<label for="name" class="label-name">
<span class="content-name">Email</span>
</label>
</form>
</center>
</div>
<div class="form4">
<center>
<form class="" action="includes/signup.inc.php" method="post">
<input type="password" name="password" autocomplete="off" required>
<label for="name" class="label-name">
<span class="content-name">Password</span>
</label>
</form>
</center>
</div>
<div class="form5">
<center>
<form class="" action="includes/signup.inc.php" method="post">
<input type="password" name="rePassword" autocomplete="off" required>
<label for="name" class="label-name">
<span class="content-name">Repeat Password</span>
</label>
</form>
</center>
</div>
<div class="signup-btn">
<button type="text" name="signup-submit">Register</button>
</div>
</form> <!-- FORM ENDING HERE -->