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<?php $x = (object)[]; var_dump($x->test);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Undefined property: stdClass::$test in /in/o9Zfm on line 4 NULL
Output for 5.6.38, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined property: stdClass::$test in /in/o9Zfm on line 4 NULL
Output for 7.3.32 - 7.3.33
NULL

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193.48 ms | 401 KiB | 197 Q