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<html><body>// Variable to check$url = "../index.html";// Remove all illegal characters from a url$url = filter_var($url, FILTER_SANITIZE_URL);// Validate urlif (filter_var($url, FILTER_VALIDATE_URL)) { echo("$url is a valid URL");} else { echo("$url is not a valid URL");}</body><!-- Mirrored from www.w3schools.com/php/phptryit.asp?filename=tryphp_func_validate_url2 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 18:10:00 GMT --></html>
https://www.w3schools.com is a valid URL