3v4l.org

run code in 500+ PHP versions simultaneously
<?php function($foo) use($foo) { };
Output for 7.0.0 - 7.0.15
Notice: Undefined variable: foo in /in/LiPQ4 on line 3
Output for 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 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.5
Fatal error: Cannot use lexical variable $foo as a parameter name in /in/LiPQ4 on line 3
Process exited with code 255.
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