Camel Case To Under Score

Camel Case To Under Score

Here is a little helper function that is the buddy to the Underscore-To-Camel-Case function. This function does the exact opposite by taking a camelCase string and converting to under_scores.

<?php
    /**
    *
    * Convert a camel case string to underscores (eg: camelCase becomes camel_case)
    *
    * @param    string    The string to convert
    * @return    string
    *
    */
    function camelCaseToUnderscore( $string )
    {
    $string[0] = strtolower($string[0]);
    $func = create_function('$c', 'return "_" . strtolower($c[1]);');
    return preg_replace_callback('/([A-Z])/', $func, $string);
    }?>

USAGE

<?php
    $string = 'thisIsACamelCaseString';
    echo camelCaseToUnderscore( $string );?>

DEMONSTRATION

this_is_a_camel_case_string