da stringa ad array con explode

[jamiel]

$stringa="prova=3&nome=mario&cognome=rossi";

$params = explode('&', $stringa);

foreach ($params as $param) {
    $details = explode('=', $param);
    $output[$details[0]] = $details[1];
}

print_r($output); 

Output:

Array
(
    [prova] => 3
    [nome] => mario
    [cognome] => rossi
)