3v4l.org

run code in 300+ PHP versions simultaneously
<?php define('FOO', 1); class bar { static $v = [ FOO => 1, FOOX => 1, ]; static $w; } // If following line is commentted out, undefined constant error disappears. var_dump(bar::$w);
Output for 8.0.0 - 8.0.12, 8.1rc1 - rc3
Fatal error: Uncaught Error: Undefined constant "FOOX" in /in/ULp0K:14 Stack trace: #0 {main} thrown in /in/ULp0K on line 14
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25
Warning: Use of undefined constant FOOX - assumed 'FOOX' (this will throw an Error in a future version of PHP) in /in/ULp0K on line 14 NULL
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
Notice: Use of undefined constant FOOX - assumed 'FOOX' in /in/ULp0K on line 14 NULL

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