3v4l.org

run code in 300+ PHP versions simultaneously
<?php class boolean { } function foo(boolean $b): void {}
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
Warning: "boolean" will be interpreted as a class name. Did you mean "bool"? Write "\boolean" to suppress this warning in /in/f1UF7 on line 5
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33

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182.65 ms | 407 KiB | 5 Q