3v4l.org

run code in 300+ PHP versions simultaneously
<?php putenv('LC_ALL=ru_RU.UTF-8'); putenv('LANG=ru_RU'); putenv('LANGUAGE=ru_RU'); setlocale (LC_ALL, "ru_RU.UTF-8"); for($i=0; $i<7; $i++){ echo setlocale(LC_ALL, 0) . "<br>\n"; usleep(100); } ?>

preferences:
43.93 ms | 402 KiB | 5 Q