Question

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Change single variable value in querystring

For example: www.example.com/feeds?arg1=xyz&arg2=abc$arg3=pqr. I want to replace the arg2 value with say 123 to get www.example.com/feeds?arg1=xyz&arg2=123$arg3=pqr. Please suggest an easiest way to attain that.

Answer 1

Process is simple.

1. Parse the query part.
2. use parse_str to extract each variable in the query
3. Replace it.
4. use http_build_query to build the query again
5. put this query string to main url

See this code.

$str = "www.example.com/feeds?arg1=xyz&arg2=abc$arg3=pqr";
$p = strpos($str, "?");
if($p!==false){
    $q = substr($str, $p+1);
    parse_str($q, $u);
    $u['arg2']='new value';
    $q=http_build_query($u);
    $str = substr($str, 0, $p). "?". $q;
}