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run code in 300+ PHP versions simultaneously
<?php error_reporting(E_ALL); echo 'Testing on PHP version ' . PHP_VERSION . PHP_EOL . PHP_EOL; sleep(1); echo 'Checking if `__DIR__` is defined...' . PHP_EOL; if (!defined('__DIR__')) { sleep(2); echo 'Nope, `defined()` returned `(bool)false`.' . PHP_EOL; echo 'So, seems like the magic constant `__DIR__` is not defined.' . PHP_EOL . PHP_EOL; sleep(2); echo 'No prob. Executing `define(\'__DIR__\', \'/foo/bar\')`...' . PHP_EOL; define('__DIR__', '/foo/bar'); sleep(1); echo 'Done, defined `__DIR__` as "/foo/bar".' . PHP_EOL . PHP_EOL; sleep(1); echo 'Double-checking `__DIR__` is defined now...' . PHP_EOL; sleep(2); if (!defined('__DIR__')) { echo 'WTF, `defined(\'__DIR__\')` again returned `(bool)false`?!' . PHP_EOL; } else{ echo 'Strike, this time `defined(\'__DIR__\')` returned `(bool)true`.' . PHP_EOL; echo 'So, seems like `__DIR__` was successfully defined. :)' . PHP_EOL . PHP_EOL; } } else{ echo 'Yep, `defined(\'__DIR__\')` returned `(bool)true`.' . PHP_EOL; echo 'The magic constant `__DIR__` seems to be defined.' . PHP_EOL . PHP_EOL; } sleep(2); echo 'Finally, here is the result of `var_dump(__DIR__)`:' . PHP_EOL; var_dump(__DIR__);

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