Online PHP editor | refs for A4p6d

<?php $json = '[{"name":"xxxxxxxx","phoneNumber":"222223wssd","amount":50.00,"won":false,"date":"2019-05-01T02:35:38"}, {"name":"xxxxxxxx","phoneNumber":"222223wssd","amount":60.05,"won":false,"date":"2019-05-01T09:01:04"}]'; $arr = json_decode($json, true); $unique = array_column($arr, null, 'phoneNumber'); echo count($unique); Var_dump($unique);