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<?php function _f($a) { return 'success'; } $f = '_f'; echo $f(); ?>
Output for 7.1.0 - 7.1.33, 7.2.6 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 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: Too few arguments to function _f(), 0 passed in /in/aZXRt on line 7 and exactly 1 expected in /in/aZXRt:3 Stack trace: #0 /in/aZXRt(7): _f() #1 {main} thrown in /in/aZXRt on line 3
Process exited with code 255.
Output for 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 - 5.6.28, 7.0.0 - 7.0.20
Warning: Missing argument 1 for _f(), called in /in/aZXRt on line 7 and defined in /in/aZXRt on line 3 success
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5
Warning: Missing argument 1 for _f() in /in/aZXRt on line 3 success

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