$pizza = "name=222&email=444&message=ghjkghjk&agree=on";
$pieces = explode("&", $pizza);
print_r($pieces) // Array ( [0] => name=222 [1] => email=444 [2] => message=ghjkghjk [3] => agree=on )
https://simple.com/?name=222&email=444&message=ghjkghjk&agree=on