Entering data onto php form, not populating MySQL table - php

Question

Have a PHP form for a registration system:
<div class="col-md-6 login-right">
<h2> Register Here </h2>
<form action="registration.php" method="post">
<div class="form-group">
<label>Username</label>
<input type="text" name="user" class="form-control" required>
</div>
<div class="form-group">
<label>Password</label>
<input type="password" name="password" class="form-control" required>
</div>
<button type="submit" class="btn btn-primary"> Register</button>
</form>
</div>
And a registration.php created:
<?php
session_start();
$con = mysqli_connect('localhost','root', 'test');
mysqli_select_db($con, 'userregistration');
$name = $_POST['user'];
$pass = $_POST['password'];
$s = " select * from usertable where name = '$name'";
$result = mysqli_query($con, $s);
$num = mysqli_num_rows($result);
if($num == 1){
echo " Username Already Taken";
}else{
$reg = " insert into usertable(name , password) values ('$name' , $pass')";
mysqli_query($con, $reg);
echo" Registration Successful";
}
?>
Also have a MySQL database created with Database: userregistration »Table: usertable. And the MySQL not sure, quite new to this isn't being populated with the inputted data from the php. When the data is inputted into the php form it requests the registration.php page which works successfully but doesn't populate the table with the data inputted.

Answer 1

You should be actively checking that the connection is successful first, and then also checking that the query was successfully executed too in order to debug this further.
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
if (mysqli_query($conn, $reg)) {
echo "New record created successfully";
} else {
echo "Error: " . $reg . "" . mysqli_error($conn);
}
You should then also close the connection