Filter Functions in PHP

filter-funcs.php

<?php
// Filter an Email Address
var_dump(filter_var('[email protected]', FILTER_VALIDATE_EMAIL)); // Returns: string(17) "[email protected]"

// This is a fake email being filtered.
var_dump(filter_var('fake_mail.com', FILTER_VALIDATE_EMAIL)); // Returns: bool(false)

var_dump(filter_var('ema(i)[email protected]', FILTER_SANITIZE_EMAIL )); // Returns: string(17) "[email protected]"

// Filter a URL
var_dump(filter_var('example.com', FILTER_VALIDATE_URL)); // Returns: bool(false)

// Filter a URL
var_dump(filter_var('http://example.com', FILTER_VALIDATE_URL)); // Returns: string(18) "http://example.com"

// Example usage
$email = '[email protected]'; // or something submitted from a form.
if(!filter_var($email, FILTER_VALIDATE_EMAIL)){ // If this returns false
	die('The email you send is invalid.');
}
?>