How to get and change URL variable PHP

Question

Hi could anyone help me with this I have a URL like

parent/child/a=1&b=2$c=3

then I have a link that would add variable to that URL

Answer 1

function replaceUrlParameters($url = '', $newParams = array()){
    if($url){
        $urlArray = parse_url($url);
        $queryString = $urlArray['query'];
        parse_str($queryString, $queryParams);
        $queryParams = array_merge($queryParams, $newParams);
        $urlArray['query'] = http_build_query($queryParams);

        if(!empty($urlArray)){
            $url = $urlArray['scheme'].'://'.$urlArray['host'].$urlArray['path'].'?'.$urlArray['query'];
        }
    }
    return $url;
}
// $newParams = array of new parameters or old parameters with new value
$replacedUrl = replaceUrlParameters($url, $newParams);

Suppose you have url like :- and you want to replace parameter b's value to test3 then just pass this url and an array with the same index with new value. for ex- 'test3']?> then you will get -