Trouble connecting data to MySQL - php

Question

I can't seem to find out why my PHP code won't allow me to store the info in MySQL when I click the submit button. Can someone tell me whats wrong with the code below?
I want to get it to the point where users submit their registration form and their info can get moved over to a MySQL database. Then, I want the users to be taken to my index.html file.
Any help is appreciated.
Thanks
<?php
$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = '';
$mysql_database = "21st";
$conn = mysqli_connect($dbhost, $dbuser, $dbpass) or die("Could not connect database");
mysqli_select_db($conn, $mysql_database) or die("Could not select database");
$username = $_POST['username'];
$email = $_POST['email'];
$password = $_POST['password'];
$password2 = $_POST['password2'];
if ($password == $password2) {
$sql = "INSERT INTO members (username, email, password) VALUES ('$userrname','$email','$password')";
} else {
echo "Your passwords must match";
}
?>

Answer 1

Try this using mysqli_query to actually run the query. When you set $sql all that did was set a variable named $sql to the query. Also note you set the variable $userrname in the query when it should be $username as set from the $_POST directly above. My adjusted version of your code below:
$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = '';
$mysql_database = "21st";
$conn = mysqli_connect($dbhost, $dbuser, $dbpass) or die("Could not connect database");
mysqli_select_db($conn, $mysql_database) or die("Could not select database");
$username = $_POST['username'];
$email = $_POST['email'];
$password = $_POST['password'];
$password2 = $_POST['password2'];
if ($password === $password2) {
// Set the query.
$sql = "INSERT INTO members (username, email, password)"
. " VALUES (?, ?, ?)"
;
// Bind the values to the query.
mysqli_stmt_bind_param($sql, 'sss', $username, $email, $password);
// Run the query.
mysqli_query($conn, $sql);
// Free the result set.
mysqli_free_result($sql);
// Close the connection.
mysqli_close($conn);
}
else {
echo "Your passwords must match";
}