Why does my user registration form not work properly? - php

Question

I am trying to create a user registration form using php and mysql. When I try to hit the submit button no new record is added to my database. The database is functional and has worked with other forms.
HTML/FORM
<?php
include 'header.php';
?>
<section>
<div class="form">
<form action="signup.php" method="post">
<h1> Sign Up!</h1>
<p>First name:
<input type="text" name="fName" maxlength="15" required pattern="^[a-zA-Z]{3,20}$" placeholder="Enter Name" />
</p>
<p>Last name:
<input type="text" name="lName" maxlength="15" pattern="^[a-zA-Z]{3,20}$" required placeholder="Enter Last Name" />
</p>
<p>Email:
<input type="email" name="email" maxlength="40" required placeholder="Enter Email" />
</p>
<p>Username:
<input type="text" name="username" maxlength="20" ^[A-Za-z0-9_]{1,15}$ required placeholder="Enter Username" />
</p>
<p>Password:
<input type="password" name="password" maxlength="20" pattern="(?=^.{8,}$)((?=.*\d)|(?=.*\W+))(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$" required placeholder="Enter Password" />
</p>
<p>Re-type Password:
<input type="password" name="password2" maxlength="20" pattern="^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?!.*\s).*$" required placeholder="Re-type Password" />
</p>
<p>
<button type="submit" name="signupbutton"> Sign up </button>
</p>
</form>
</div>
</section>
<div class="footerspecial">
<?php
include 'footer.php';
?>
</div>
PHP/SQL
<?php
//have they submitted at least once?
if(isset($POST['$password2'])){
$fName = $_POST['fName'];
$lName = $_POST['lName'];
$username = $_POST['username'];
$email = $_POST['email'];
$password = $_POST['password'];
$password2 = $_POST['password2'];
//do the passwords NOT match?
if ($password !== $password2) {//do string comparison here
echo'<h2>Error: passwrods don\'t match!</h2>';
require ('registerform.php');
}
else {
//does the username already exist?
$sql = mysql_query("SELECT * FROM users WHERE username=='$username'");
if ($results=$con->query($sql)){
echo'<h2>Error: username is already taken</h2>';
require ('registerform.php');
}
else {
$sql = mysql_query("SELECT * FROM users WHERE email=='$email'");
if ($results=$con->query($sql)){
echo'<h2>Error: email already used</h2>';
require ('registerform.php');
}
else {
// If the values are posted, insert them into the database.
$sql= "INSERT INTO users (fName, lName, email, username, password, password2) VALUES ('$fName', '$lName', '$email', '$username', '$password', $password2)";
if (!$con->query($sql)){
echo 'Error: coulndt do suff';
}
else {
echo 'Account made';
}//ENDS SUCCESSFUL INSURT
}//ENDS EMAIL VALIDATION
}//ENDS THE USERNAME VALIDATION
}//END PASSWORD VALIDATION
}
?>
Picture of the form don't really know if its helpful but ya'know
https://gyazo.com/418b86ecb5090604a1f229e1e94fe3bf

Answer 1

I'm guessing here that your database doesn't have a password2 column (seems kind of pointless to have) so trying to insert into it will give an error.
You should read about MySQLi error reporting
Also add error_reporting(-1); at the start of your PHP file to show PHP errors.
P.S. your code is vulnerable to SQL injection, you should use prepared statements to be safe from this.

Answer 2

Could have multiple problems first you do not have the single quotes around $password2. This could be leading to a failed insert.
VALUES ('$fName', '$lName', '$email', '$username', '$password', $password2)";
Also I would echo the sql errors out as you are not doing. you can do this easily. Test the if statement for a true not a false
if ($con->query($sql)){
//if true then runs your code;
}
else {
echo "Error: " . $sql . "<br>" . $con->error; // This will echo out any sql errors you may have
}