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<?php $x = array(1.1); var_dump(@array_walk($x, 'strval'));
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 ArgumentCountError: strval() expects exactly 1 argument, 2 given in /in/Ps0rP:5 Stack trace: #0 [internal function]: strval(1.1, 0) #1 /in/Ps0rP(5): array_walk(Array, 'strval') #2 {main} thrown in /in/Ps0rP on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.11, 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, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.31, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
bool(true)

preferences:
294.57 ms | 405 KiB | 446 Q