- var_dump: documentation ( source)
- filter_var: documentation ( source)
<?php
var_dump(filter_var("https://test.com/?q=123456", FILTER_VALIDATE_URL));
var_dump(filter_var("https://test.com?q=123456", FILTER_VALIDATE_URL));
var_dump(filter_var("https://test.com/?q=123/456", FILTER_VALIDATE_URL));
var_dump(filter_var("https://test.com?q=123/456", FILTER_VALIDATE_URL));