Online PHP editor | refs for bo1Jb

<?php $_GET = [ 'a' => 1, 'b' => 2, 'c' => 3, ]; $_SERVER = [ 'HTTP_HOST' => 'http://www.example.com', 'SCRIPT_NAME' => '/test.php', ]; function c_url($key) { unset($_GET[$key]); $queryString = http_build_query($_GET); return 'http://' .$_SERVER['HTTP_HOST'].$_SERVER['SCRIPT_NAME'].'?'.$queryString; } echo c_url('b') . '&b=5';