[php-src] Issue #12106: if query parameter value processing is different when value is empty or null

Issue: https://github.com/php/php-src/issues/12106 Author: HeenaBansal2009 ### Description The following code: CASE 1: ``` <?php $url = "http://localhost:8964/?soap"; CASE1: parse_url($url); echo var_dump(parse_url($url)); $query = parse_str(parse_url($url)["query"], $result); echo var_dump($result); $http_query = http_build_query($result); echo $http_query; //CASE2 assign query param value to null $result["soap"]=null; echo $http_query; //CASE 3 - replicate same as case 2 but in other form and results are different. $arr = array('test' => null); echo http_build_query($arr); ?> ``` ``` array(5) { ["scheme"]=> string(4) "http" ["host"]=> string(9) "localhost" ["port"]=> int(8964) ["path"]=> string(1) "/" ["query"]=> string(4) "soap" } array(1) { ["soap"]=> string(0) "" } soap=soap= ``` But I expected this output instead: CASE1: soap= CASE2: soap CASE3 soap PS: if query param value is empty string or null , but query param should be in url. ### PHP Version PHP 8.1.2 ### Operating System _No response_