- preg_replace: documentation ( source)
<?php
// Everything you enter here will be executed by our servers. Try it!
$uri = "?sort%5B%5D=1&str%5B%5D=4&curs%5B%5D=1&page=2&page=1&page=2&page=5&page=4&page=3&page=2&page=1&page=1&page=1&page=1&page=1&page=1&page=1&page=1&page=1&page=1&page=1";
echo preg_replace("/[?&]page=[0-9]/", "", $uri);