- array_map: documentation ( source)
- var_dump: documentation ( source)
- explode: documentation ( source)
- trim: documentation ( source)
<?php
$value= '"_aaaaaaa","_bbbbbb","_cccccc","_dddddd"';
$array = array_map(function($v) { return trim($v, '"'); }, explode(',', $value));
var_dump($array);