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run code in 300+ PHP versions simultaneously
<?php if (!is_callable(function(){echo "Hello";})) { function sayHello() { echo "World!"; } } sayHello();
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.14, 8.4.1
Fatal error: Uncaught Error: Call to undefined function sayHello() in /in/rD0oB:7 Stack trace: #0 {main} thrown in /in/rD0oB on line 7
Process exited with code 255.
Output for 5.6.0 - 5.6.40
Fatal error: Call to undefined function sayHello() in /in/rD0oB on line 7
Process exited with code 255.

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