【PHP】获取字符串的两个字符中间的内容

   /**
     * Author: 小破孩
     * Email: 3584685883@qq.com
     * Time: 2022/2/14 16:12
     * @param $str
     * @param $separator
     * @param string $mark
     * @return bool|false|mixed|string
     * Description:获取字符串
     */
    public function getSubStr($str,$separator,$mark=':'){
        $arr = explode($separator,$str);
        if (empty($arr) || !isset($arr[1])) {
            return false;
        }
        $str = $arr[1];
        if (strpos($str,$mark) !== false) {
            return substr($str,0,strpos($str,$mark));
        }else{
            return $str;
        }
    }