Handy function to return file extension

composer.json

{
    "name": "attitude/Functions/get_file_extension"
}

function-get_file_extension.php

<?php

/**
 * Handy function to return file extension
 *
 * @param   string  $str    Any file name, path or url
 * @returns mixed           Extension (string) or false (bool)
 * @author                  Martin Adamko <@martin_adamko>
 * @license                 The MIT License <http://opensource.org/licenses/MIT>
 *
 */
function get_file_extension($str)
{
    return substr(strrchr($str,'.'),1);
}