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run code in 300+ PHP versions simultaneously
<?php $string = 'abcdef'; echo substr($string, 0, substr($string, -1));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: substr(): Argument #3 ($length) must be of type ?int, string given in /in/RltW0:3 Stack trace: #0 /in/RltW0(3): substr('abcdef', 0, 'f') #1 {main} thrown in /in/RltW0 on line 3
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: substr() expects parameter 3 to be int, string given in /in/RltW0 on line 3
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Warning: substr() expects parameter 3 to be integer, string given in /in/RltW0 on line 3
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Warning: substr() expects parameter 3 to be long, string given in /in/RltW0 on line 3
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

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