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run code in 300+ PHP versions simultaneously
<?php if (version_compare(PHP_VERSION, '5.0.0', '>=')) { exit; } print_r(time()); define('FOO', time()); class BAR{ public static $BAZ = FOO; } sleep(5); print_r(BAR::$BAZ);

preferences:
30.46 ms | 402 KiB | 5 Q