3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 0; ++$a; // 1 class Foo { function __construct() {} } new Foo(++$a); // 2 function bar() {} bar(++$a); // 3 class WTF { } new WTF(++$a); // 4 var_dump($a);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
int(4)
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
int(3)

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277.93 ms | 402 KiB | 376 Q