3v4l.org

run code in 500+ PHP versions simultaneously
<?php $test = [ TRUE => TRUE, FALSE => FALSE, 'string' => 'string', ]; var_dump($test); var_dump($test[TRUE]); var_dump($test[FALSE]); print "---\n"; foreach ($test as $key => $value) { var_dump(is_bool($key)); var_dump($key == FALSE); }

preferences:
91.02 ms | 1284 KiB | 5 Q