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run code in 300+ PHP versions simultaneously
<?php declare(strict_types=1); $foo = substr(52, 1); var_dump($foo);
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 #1 ($string) must be of type string, int given in /in/F6nKY:5 Stack trace: #0 /in/F6nKY(5): substr(52, 1) #1 {main} thrown in /in/F6nKY on line 5
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: substr() expects parameter 1 to be string, int given in /in/F6nKY:5 Stack trace: #0 /in/F6nKY(5): substr(52, 1) #1 {main} thrown in /in/F6nKY on line 5
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Fatal error: Uncaught TypeError: substr() expects parameter 1 to be string, integer given in /in/F6nKY:5 Stack trace: #0 /in/F6nKY(5): substr(52, 1) #1 {main} thrown in /in/F6nKY on line 5
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 - 5.6.40
Warning: Unsupported declare 'strict_types' in /in/F6nKY on line 3 string(1) "2"
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
string(1) "2"

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