<?php

 $details = array ( "0"  => array ( "pid" => "402",
                                       "q" => "1",
                                       "s" => "0"
                                     ),
                   "1"  => array ( "pid" => "403",
                                       "q" => "2",
                                       "s" => "0"
                                     ),
                   "2"  => array ( "pid" => "402",
                                       "q" => "3",
                                       "s" => "0"
                                     ),
                   "3"  => array ( "pid" => "403",
                                       "q" => "1",
                                       "s" => "0"
                                     ),
                   "4"  => array ( "pid" => "405",
                                       "q" => "1",
                                       "s" => "0"
                                     ),
                );

?>

0-pid 402 q 4 s 0
 1-pid 403 q 2 s 0
 4-pid 405 q 1 s 0