php code show blank screen in godaddy web hosting - php

Question

<?php
ini_set('error_reporting', E_ALL);
//create empty Variable
$username= $password= $email="";
//check the field is not empty
if (empty(($_POST["Username"]))) {
echo "Username should not be empty";
} else {
if (!empty(($_POST["Username"]=="/^[a-zA-Z0-9_-.]{3,15}$/"))) {
echo "Username should contain character,number,dash,underscore,dot only";
}
}
if (empty(($_POST["Password"]))) {
echo "password should not be empty";
} else {
if (!empty(($_POST["Password"]=="/^[a-zA-z0-9#]{3,15}$/"))) {
echo "Password should contain character,number,# only";
}
}
if (empty($_POST["Email"])) {
echo "Email field should not be empty";
} else {
// check if e-mail address is well-formed
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
$email = "Invalid email format";
}
}
//connect to Mysql Database
$servername = "localhost";
$username = "";
$password = "";
$dbname = "";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$conn->select_db("spinjobs");
//check if the username already exits in database table
if(isset($_POST["$username"]) && $_POST["$username"] != ""){
$sql_username = mysqli_query("SELECT id FROM newuser WHERE username='$username' LIMIT 1");
$username = mysqli_num_rows($sql_username);
if ($username < 1) {
echo '<strong>' . $username . '</strong> is OK';
exit();
} else {
echo '<strong>' . $username . '</strong> is taken';
exit();
}
}
$query = "INSERT INTO `newuser` ( `username`, `email`, `password`) VALUES ( '$username', '$email', '$password')";
$result = mysqli_query($conn, $query);
if (mysqli_affected_rows($conn) == 1) { //If the Insert Query was successfull.
// Send an email
$from = 'donotreply#spinfonet.com';
$to = $email;
$subject ='You are successfully Registered with us';
$message = 'Your $username, $password\r\n Please preserve this mail for your reference';
mail($from, $to, $subject, $message);
}
mysqli_close($conn);
?>
I am using GoDaddy as web host and upload this code file to my webhost space. I have Linux operating system with web host, while I type code on Notepad++ in Windows 10.
When I test my page in browser after filling record in HTML page and submit browser shows blank page, I have checked my PHP code with some of free online code testing website. This website do not find any mistake in code, can you guide what should be the mistake?
GoDaddy gives three version of PHP 5.4, 5.5, and 5.6. I have selected 5.6, 5.4 and 5.5 also have given blank page.

Answer 1

It's very likely that display_errors it's turned off. You can change that in the php.ini file:
display_errors = On
Here's where to find the file:
https://www.godaddy.com/help/what-filename-does-my-php-initialization-file-need-to-use-8913
Most of the time, it's in the root directory.

Answer 2

Solution given on godaddy community:
Steps:
Go to CPanel dashboard
Go to 'Select PHP Version', you should see a bunch of checkboxes
Set PHP version (min 5.4)
Uncheck the 'mysqli' extension and check both 'mysqlind' and 'nd_mysqli'
Apparently 'nd_mysqli' is 'mysqli' but configured to work with 'mysqlind' and to make it work you have to uncheck 'mysqli' due to settings conflicts.
This information was hidden deep within a stackoverflow answer that I can no longer find. Hope this helps some other people.

Answer 3

Make sure these values are correct according to your settings. And use mysqli_connect_error() function:
$servername = "server addresss";
$username = "";
$password = "";
$dbname = "";