3v4l.org

run code in 300+ PHP versions simultaneously
<?php if (@__DIR__ == '__DIR__') { echo 'magic __DIR__ constant NOT defined' . PHP_EOL; define('__DIR__', substr(__FILE__, 0, strrpos(__FILE__, DIRECTORY_SEPARATOR))); } else { echo 'magic __DIR__ constant IS defined' . PHP_EOL; } var_dump(__DIR__);
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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
magic __DIR__ constant IS defined string(3) "/in"
Output for 4.3.10 - 4.3.11, 4.4.0 - 4.4.9, 5.0.2 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
magic __DIR__ constant NOT defined string(3) "/in"
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.1
magic __DIR__ constant NOT definedPHP_EOLstring(3) "/in"
preferences:
236.97 ms | 402 KiB | 460 Q