Online PHP editor | output for Ig5oM

<?php define('DB_HOST','localhost'); define('DB_NAME','client_registration'); define('DB_USER','lunaone'); define('DB_PASSWORD','lunaone'); $con=mysqli_connect(DB_HOST,DB_USER,DB_PASSWORD) or die("Failed to connect to MySQL: " . mysql_error()); $db=mysql_select_db(DB_NAME,$con) or die("Failed to connect to MySQL: " . mysql_error()); function NewUser() { $firstName = $_POST['first_name']; $lastName = $_POST['last_name']; $companyName = $_POST['company_name']; $phoneNumber = $_POST['phone_number']; $email = $_POST['email_address']; $password = $_POST['password']; $query = "INSERT INTO WebsiteUsers (firstName,lastName,companyName,phoneNumber,email_address,password) VALUES ('$irstName','$lastName''$companyName','$phoneNumber','$email_address','$password')"; $data = mysql_query ($query)or die(mysql_error()); if($data) { echo "YOUR REGISTRATION IS COMPLETED..."; } } function SignUp() { if(!empty($_POST['user'])) //checking the 'user' name which is from Sign-Up.html, is it empty or have some text { $query = mysql_query("SELECT * FROM WebsiteUsers WHERE email_address = '$_POST[email_address]' AND password = '$_POST[password]'") or die(mysql_error()); if(!$row = mysql_fetch_array($query) or die(mysql_error())) { newuser(); } else { echo "SORRY...YOU ARE ALREADY REGISTERED USER..."; } } } if(isset($_POST['submit'])) { SignUp(); } ?>