<?php
$url = "https://stackoverflow.com/questions/53304342/checking-the-uri-php";
if (filter_var($url, FILTER_VALIDATE_URL)) {
echo "$url is a valid URL";
} else {
echo "$url is not a valid URL";
}
https://stackoverflow.com/questions/53304342/checking-the-uri-php is a valid URL
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
https://stackoverflow.com/questions/53304342/checking-the-uri-php is a valid URL