uncamel.php

<?php
/**
 * Reverse a CamelCase string.
 *
 * Examples:
 *     uncamel('lowerCamelCase') === 'lower_camel_case'
 *     uncamel('UpperCamelCase') === 'upper_camel_case'
 *     uncamel('ThisIsAString') === 'this_is_a_string'
 *     uncamel('notcamelcase') === 'notcamelcase'
 *     uncamel('lowerCamelCase', ' | ') === 'lower | camel | case'
 *
 * @author    Mehdi Kabab <http://pioupioum.fr/>
 * @copyright 2010 Mehdi Kabab
 * @license   http://www.opensource.org/licenses/mit-license.html MIT License
 * @link      http://pioupioum.fr/snippets/php-function-uncamel-supprimer-camel-case.html
 *
 * @param  string $content The CamelCase string.
 * @param  string $separator The glue for the compound words. Defaults to '_'.
 * @return string
 */
function uncamel($content, $separator = '_')
{
	$content = preg_replace('#(?<=[a-zA-Z])([A-Z])(?=[a-zA-Z])#e', "'$separator' . strtolower('$1')", $content);
	$content{0} = strtolower($content{0});

	return $content;
}