<?php
/**
 * 项目助手函数
 * @author yupoxiong<i@yufuping.com>
 */


if (!function_exists('get_middle_str')) {
    /**
     * @param $str
     * @param $leftStr
     * @param $rightStr
     * @return bool|string
     */
    function get_middle_str($str, $leftStr, $rightStr)
    {
        $left  = strpos($str, $leftStr);
        $right = strpos($str, $rightStr, $left);
        if ($right < $left || $left < 0) {
            return '';
        }
        return substr($str, $left + strlen($leftStr), $right - $left - strlen($leftStr));
    }
}