<?php $string = "(Here {is [a] Special} Title)! & it's fine, right?"; echo preg_replace('~[^a-z]~', '_', strtolower($string)); // all non-letters become underscores echo "\n\n"; echo str_replace(' ', '_', preg_replace('~[^a-z ]+~', '', strtolower($string))); // notice the consecutive underscores echo "\n\n"; echo preg_replace(['~[^a-z ]+~', '~ +~'], ['', '_'], strtolower($string)); // notice no consecutive underscores
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