- json_decode: documentation ( source)
<?php
$json = '["4a21da2670ce6528b2cffebf6f42cb1b8ade3c13.png","4d9465c0694079296b24f6e3be7b226eaa9f94dd.png"]';
$array = json_decode($json);
foreach($array as $a) {
echo '<img src="/uploads/products/'.$a.'" width="35">';
}