3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo strtolower(preg_replace('/([a-zA-Z])\s*=\s*([a-zA-Z])\s*(AND|OR)/i', '$1_$2', 'algo = asslgo AND'));
Output for 4.3.0 - 7.1.0
algo = asslgo and