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run code in 200+ php & hhvm versions
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<?php $a = array("hi" => "yes"); if($a["hiasfd"] == NULL) { echo "NULL"; } else { echo "NOT NULL"; }
based on ARJYa
Output for 5.3.0 - 7.2.0
Notice: Undefined index: hiasfd in /in/2TpgO on line 3 NULL
Output for 4.3.0 - 5.2.17
Notice: Undefined index: hiasfd in /in/2TpgO on line 3 NULL