class self_test {

    const PC = 'pc';

    const SP = 'sp';

    private $_splist = array('iPhone','Android','iPod','iPad','Tizen');//設定經常使用的sp終端,暫時常用的sp端就這幾種,如果有的話大家也可以增加 

    private $terminal;

    public function __construct(){
        $this->setTerminal();//通過setTerminal()方法獲取到$terminal變數的值 
    }

    /* 
     * function setTerminal() 
     * 獲取終端資訊 
     * @return string 
     */

    private function setTerminal(){
        $isSp = false;
        foreach($this->_splist as $spname){
            if (strstr($_SERVER['HTTP_USER_AGENT'], $spname)) {
                $isSp = true;
                break;
            }
        }
        return $this->terminal = ($isSp) ? self::SP : self::PC;
    }

    /* 
     * function PC_SP() 
     * 輸出終端資訊 
     * @return string 
     */
    public function PC_SP(){
        return $this->terminal;
    }
}

$str = new self_test();
echo $str->PC_SP();//輸出目前客戶使用的是PC還是SP