- json_decode: documentation ( source)
<?php
$s = '[{"ID": "ALLEVARD","sheetURL":"https://docs.google.com/document/d/1wugfxhBDeUc-qDHqzFTGsNbfZHulgp-uN9JnpY1_A0A/edit?usp=sharing","imgURL":"https://s3.amazonaws.com/f.cl.ly/items/1j0t32293C1l442N2921/AllevardKing.jpg?v=2cff0154" }]';
$obj = json_decode($s);
echo $obj[0];