3v4l.org

run code in 300+ PHP versions simultaneously
<?php function x(): void { return null; }
Output for 7.1.0 - 7.1.17, 7.2.0 - 7.2.6
Fatal error: A void function must not return a value (did you mean "return;" instead of "return null;"?) in /in/jAhvX on line 4
Process exited with code 255.
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