手機號中間四位轉*號

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/**     * 手機號中間四位轉*號     * @param $tel 手機號碼     * @return mixed     */    public function mobile_change($tel){        $str = substr($tel,0,3);        $strs = substr($tel,0,4);        if ($str == ‘+86‘){            $tel_sub = substr($tel,3,11);        }elseif ($strs == ‘+852‘ || $strs == ‘+853‘ || $strs == ‘+886‘){            $tel_sub = substr($tel,4,11);        }        return substr_replace($tel_sub, ‘****‘, 3, 4);    }

 

手機號中間四位轉*號