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<?php foreach ( @array_keys(null) as $day ) { var_dump($day); }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, null given in /in/l5lWO:3 Stack trace: #0 /in/l5lWO(3): array_keys(NULL) #1 {main} thrown in /in/l5lWO on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.10, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.29 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Warning: Invalid argument supplied for foreach() in /in/l5lWO on line 3
Output for 4.3.11

preferences:
252.92 ms | 401 KiB | 310 Q