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<?php $lol = []; $a= $lol['ciao']; var_export($a);
Output for 8.0.0 - 8.0.3
Warning: Undefined array key "ciao" in /in/lO5ms on line 5 NULL
Output for 7.3.0 - 7.3.28, 7.4.0 - 7.4.16
Notice: Undefined index: ciao in /in/lO5ms on line 5 NULL