<!DOCTYPE html>
<html>
<body>
<?php
// Variable to check
$url = "http://www.w3schools.com";
// Validate url
if (!filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_QUERY_REQUIRED) === false) {
echo("$url is a valid URL");
} else {
echo("$url is not a valid URL");
}
?>
</body>
</html>