<?php error_reporting(-1); // show all possible errors $obj = new stdclass(); $arr = array(); var_dump($arr['foo']); // Notice: Undefined index var_dump($arr[$obj]); // Warning: Illegal offset type $arr = null; var_dump($arr['foo']); // No error var_dump($arr[$obj]); // No error $arr = null; $arr['i'] = $arr['i'] + 1; // No error $arr = null; $arr['i']++; // Notice: Undefined index
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