<code lang="php">function pairstr2Arr ($str, $separator='=', $delim=',') {
    $elems = explode($delim, $str);
    foreach( $elems as $elem => $val ) {
        $val = trim($val);
        $nameVal[] = explode($separator, $val);
        $arr[trim(strtolower($nameVal[$elem][0]))] = trim($nameVal[$elem][1]);
    }
	return $arr;
}

//  Example usage:
$string = '1=one, 2=two , 3=three , Site=apple , name= Joe Bloggs';
$array = pairstr2Arr($string);

echo '<pre>';
print_r($array);
echo '</pre>';>

//  Returns:
Array
(
    [1] => one
    [2] => two
    [3] => three
    [site] => apple
    [name] => Joe Bloggs
)</code>