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run code in 300+ PHP versions simultaneously
<?php if(version_compare(PHP_VERSION, '5.3.0') < 0) { return; } class c { public static $f; public function __construct() { var_dump(get_class(self::$f)); } } c:$f = function() { return 'ok'; }; new c();

preferences:
37.98 ms | 402 KiB | 5 Q