Online PHP editor | output for Kkr8M

<?php ini_set('display_errors', 1); error_reporting(E_ALL); echo '#+++++++++++++++++++++++++++++++++++#' . PHP_EOL; echo '# Checking if a constant is defined #' . PHP_EOL; echo '# always retuns (bool)false in PHP. #' . PHP_EOL; echo '# Even if it has been defined! #' . PHP_EOL; echo '#+++++++++++++++++++++++++++++++++++#' . PHP_EOL; echo 'Testing on PHP version ' . PHP_VERSION . PHP_EOL . PHP_EOL; echo 'Result of `echo __FILE__`: ' . PHP_EOL; echo __FILE__; echo PHP_EOL . PHP_EOL; echo 'Okay, looks like __FILE__ is defined.' . PHP_EOL; echo 'Now let\'s see what `if ( defined('__FILE__') )` returns:' . PHP_EOL; var_dump(defined('__FILE__'));