使用PHP的Bootstrap表单，MySQL不向数据库发送数据[关闭]

Question

I've been trying to debug this for ages now and don't understand why is it not sending data to my database. Also as an indication, I'm using Boostrap and this form is inside of a modal. Can someone help me out please. I will include my html snipet as well as php code.

HTML CODE

<form class="form-horizontal" role="form" action="register.php" method="POST">
      <div class="input-group margin-bottom-sm"><span class="input-group-addon"><i class="glyphicon glyphicon-user" aria-hidden="true"></i></span>                        <input class="form-control" type="text" name="fname" id="FirstName" placeholder="First Name" required>
           </div></br>
          
        <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-user" aria-hidden="true"></i></span>
                    <input class="form-control" type="text" name="lname" id="LastName" placeholder="Last Name" required>
        </div></br>
        
        <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-calendar" aria-hidden="true"></i></span>
                    <input class="form-control" type="text" name="dob" id="dob" placeholder="Date of Birth" required>
        </div><br>
        
        <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-book" aria-hidden="true"></i></span>
                    <input class="form-control" type="text"  name="school" id="SchoolName" placeholder="School" required>
        </div></br>
    
        <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-user" aria-hidden="true"></i></span>
                    <input class="form-control" type="text" name="username" id="Username" placeholder="Username" required>
        </div></br>
      
        <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-lock" aria-hidden="true"></i></span>
                    <input class="form-control" type="password"  name="pass" data-minlenght= "6" id="Pass" placeholder="Password" required> 
        </div><div class="help-block">Minimum of 6 characters</div></br></br>
        
        <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-lock" aria-hidden="true"></i></span>
                    <input class="form-control" type="password" id="inputPasswordConfirm" data-match="#inputPassword"
                           data-match-error="Whoops, these don't match" placeholder="Confirm" required>
        </div></br>
    
        <div class="form-group">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="submit" class="btn btn-primary" id="register">Sing Up</button>
        </div>
    
        </form>

PHP

<?php

$conn=mysqli_connect("localhost","mydatabase","mypassword")
    or die("Could not connect:".mysqli_error($conn));
mysqli_select_db($conn , 'mydatabase') or die ('Database will not open');

if(isset($_POST['register'])){


    $fname = ($_POST['FirstName']);  
    $lname = ($_POST['LastName']);
    $dob = ($_POST['dob']);
    $school = ($_POST['SchoolName']);
    $username = ($_POST['Username']);
    $pass = ($_POST['Pass']);


    $query = "INSERT INTO users (FirstName,LastName,dob,SchoolName,Username,Pass)VALUES('$FirstName','$LastName','$Username','$dob', '$SchoolName','$Pass',)";
    $result = mysqli_query($conn,$query);
}
?>

</div>

Answer 1

So lets clear this up somewhat..

Firstly your query order is completely incorrect (take note of: FirstName,LastName,dob) this means the first 3 values should be $fname,$lname,$dob but instead you've added in $username for some reason..

NOTE: You were adding in non existent variables such as $FirstName when the actual assigned variable is in fact: $fname.

Your query (take note of the last variable $Pass,) because this is the last variable entry you don't add a comma take a look:

$query = "INSERT INTO users (FirstName,LastName,dob,SchoolName,Username,Pass)VALUES('$FirstName','$LastName','$Username','$dob', '$SchoolName','$Pass',)";

should be:

$query = "INSERT INTO users (`FirstName`,`LastName`,`dob`,`SchoolName`,`Username`,`Pass`)VALUES('$fname','$lname','$dob','$school','$username','$pass')";

Better still you could bind the params to prevent SQL Injection like below:

$query = "INSERT INTO users (`FirstName`,`LastName`,`dob`,`SchoolName`,`Username`,`Pass`)VALUES(?,?,?,?,?,?)";
$query->bind_param("ssssss", $fname, $lname, $dob, $school, $username, $pass);

Next up..

You're calling if(isset($_POST['register'])){

Yet your <button type="submit" class="btn btn-primary" id="register">Sing Up</button> has no name="register">

Therefore it should be: <button type="submit" class="btn btn-primary" id="register" name="register">Sing Up</button>

Also, you should never save a password as plain text to a database. You should run password_hash($pass, PASSWORD_DEFAULT); this will encrypt the passwords submitted to the database - Before doing so I recommend that you read up on the documentation.