How to return only named groups with preg_match or preg_match_all?

Question

Example:

$string = \"This is some text written on 2010-07-18.\";
preg_match(\'|(?\\d\\d\\d\\d-\\d\\d-\\d\\d)|i\', $string, $arr_result);
print_r(         


        

Answer 1

I read in your post that these are possible overloads of future memory etc ... In this case, why no't can be solved with an unset():

$string = "This is some text written on 2010-07-18.";
preg_match('|(?\d{4}-\d{2}-\d{2})|i', $string, $arr_result);
$date = array("date" => $arr_result['date']);
unset($arr_result, $string);//delete array and string preg_match origen

print_r($date);
//or create a new:
//  $arr_result = $date;
//print_r($arr_result);