some usefull php methods

php-methods.php

<?php

/**
     * Converts a CamelCase word into snake_case
     *     - improved version of http://stackoverflow.com/a/19533226
     *     - this version avoid failing when using the $input = "_ThisIsATest_To_check_this"
     *          . stack overlow answer will output "__this_is_atest__to_check_this"
     *          . this improved version will output "this_is_a_test_to_check_this"
     *
     * @author Exadra37 exadra37 in gmail point com
     *
     * @version  1.0.0
     *
     * @since  12/02/2014 - v.1.0.0
     *
     * @param  string $input - string to convert to snake_case
     *
     * @return string        - string converted to snake_case
     */
    public function snakeCase($input, $splitter = "_")
    {
       return ctype_lower($input) ? $input : str_replace(array("-", "_", "{$splitter}{$splitter}"), $splitter,ltrim(strtolower(preg_replace("/[A-Z]/", "{$splitter}$0", $input)), $splitter));
    }