- var_dump: documentation ( source)
- json_decode: documentation ( source)
<?php
$list = '[["A1","B1","C1","D1","E1"],["A2","B2","C2","D2","E2"],["A3","B3","C3","D3","E3"],["A4","B4","C4","D4","E4"],["A5","B5","C5","D5","E5"]]';
$data = json_decode($list);
var_dump($data);