<?php
$s = '(("1","abc","325"),("2","def","1254"),("3","ghi","4568"))';$ar = eval('return '.str_replace('(', 'array(', $s).';');print_r($ar);
?>
out:
Array
(
    [0] => Array
        (
            [0] => 1
            [1] => abc
            [2] => 325
        )    [1] => Array
        (
            [0] => 2
            [1] => def
            [2] => 1254
        )    [2] => Array
        (
            [0] => 3
            [1] => ghi
            [2] => 4568
        ))