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run code in 300+ PHP versions simultaneously
<?php declare(strict_types=1); function foo (string $bar = null ): string { echo 'test'; }; foo(); foo(null); foo('100');
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
test Fatal error: Uncaught TypeError: foo(): Return value must be of type string, none returned in /in/s9V0K:8 Stack trace: #0 /in/s9V0K(10): foo() #1 {main} thrown in /in/s9V0K on line 8
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
test Fatal error: Uncaught TypeError: Return value of foo() must be of the type string, none returned in /in/s9V0K:8 Stack trace: #0 /in/s9V0K(10): foo() #1 {main} thrown in /in/s9V0K on line 8
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.21
Warning: Unsupported declare 'strict_types' in /in/s9V0K on line 3 Parse error: syntax error, unexpected ':', expecting '{' in /in/s9V0K on line 6
Process exited with code 255.

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