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run code in 300+ PHP versions simultaneously
<?php function f1($p = null) { var_dump($p); } function f2($p = false) { var_dump($p); } f1(); f1(false); f1(null); f1("qualcosa"); echo "\n\n"; f2(); f2(false); f2(null); f2("qualcosa");

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40.99 ms | 402 KiB | 5 Q