PHP号码归属地区分自动化查询API封装

<?php

/*
        电话号码区分地址.储存到数据库;
*/

class Filter{

    private $_phone = '';
    private $_api = 'http://mobsec-dianhua.baidu.com/dianhua_api/open/location?tel=';
    private $_user;
    private $_host;
    private $_pwd;
    private $_dbname;
    private static $conn = null;

    private function __construct () {

    }

    public static function _interance () {
        // 返回实例
        if (self::$conn == null) return self::$conn = new Filter;
    }
    /*
        param host
        param user
        param pwd
        param dbname
        return null
    */

    public function _conn ($host, $user, $pwd, $dbname) {
        $this->_host = $host;
        $this->_user = $user;
        $this->_pwd  = $pwd;
        $this->_dbname = $dbname;
    }

    public function _select () {
        try {
            $pdo = new PDO('mysql:host=' . $this->_host . ';dbname=' . $this->_dbname, $this->_user, $this->_pwd);
            $pdo->query("SET CHARSET 'utf8'");
        } catch (PDOException $e) {
            die("Connection fail:") . $e->getMessage();
        }

        $sql = "SELECT * FROM phone WHERE"; // 待优化的sql语句
        $stmt = $pdo->prepare($sql);
        $stmt->execute();
        while ($result = $stmt->fetch(PDO::FETCH_ASSOC)) {
            if ($result != []) return $result;
        }

    }

    /*
        param phone 电话
        return null
    */

    public function _setdata ($phone) {
        if ($phone != null and strlen($phone) == 11) {
            $this->_phone = $phone;
        }
    }

    /*
        param phone 电话
        param api   api地址
        return json 字符串
    */

    public function _rseponseText () {
        $ch = curl_init();
        $str = $this->_api . $this->_phone;
        curl_setopt($ch, CURLOPT_URL, $str);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $output = curl_exec($ch);
        return $output;
    }
}

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