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run code in 300+ PHP versions simultaneously
<?php var_dump(is_string('324', 'test'));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Fatal error: Uncaught ArgumentCountError: is_string() expects exactly 1 argument, 2 given in /in/VUmEK:2 Stack trace: #0 /in/VUmEK(2): is_string('324', 'test') #1 {main} thrown in /in/VUmEK on line 2
Process exited with code 255.
Output for 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, 7.1.0 - 7.1.10, 7.2.29 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Warning: is_string() expects exactly 1 parameter, 2 given in /in/VUmEK on line 2 bool(false)
Output for 4.3.2 - 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
Warning: is_string(): Only one argument expected in /in/VUmEK on line 2 bool(false)
Output for 4.3.0 - 4.3.1
Warning: is_string() [http://www.php.net/function.is-string]: Only one argument expected in /in/VUmEK on line 2 bool(false)

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