Online PHP editor | refs for GpXc9

<?php error_reporting(-1); $null = null; $arr = array(); $str = 'string'; $num = 7; $bool = true; $obj = new stdClass(); echo $null['nope']; echo $null['nope']['sure']; echo $arr['nope']; echo $arr['nope']['sure']; echo $str['nope']; echo $str['nope']['sure']; echo $num['nope']; echo $num['nope']['sure']; echo $bool['nope']; echo $bool['nope']['sure']; echo $obj['nope']; echo $obj['nope']['sure'];