<?php
/**
 * ajax业务处理中的接口转发层，解决ajax跨域访问的问题
 *   工作原理：问请求通过本程序做中转，在本地服务器层完成与远程服务接口的交互
 *   备注：使用时 URL_ROOT 这个参数需要根据你的目标接口地址进行修改，本转发层之能用于单接口的Web Service接口服务
 *        程序支持POST数据与GET数量的同时转发;
 * @version 1.0.0.2
 * @author JerryLi lijian@dzs.mobi
 * @copyright b.dzs.mobi 2012-11-16
 * */
class interface_relay
{
    /**接口根地址(此处是需要修改的地方)*/
    const URL_ROOT = 'http://www.uessq.com/region.php';
    /**字符集*/
    const CHARSET = 'UTF-8';
    /**GET*/
    private $msGets = '';
    /**POST*/
    private $maGetPostData = array();

    function __construct()
    {
        $this->getPOST();
        $this->getGET();
        if($this->msGets != '' || count($this->maGetPostData) > 0)
        {	//存在输入数据
//            if(count($this->msGets) > 0)
//                $sUrl = self::URL_ROOT .'?'. $this->msGets;
//            else
                $sUrl = self::URL_ROOT;
            header('Content-Type: text/html; charset='. self::CHARSET);
            echo $this->getContent($sUrl);
        }
        else
        {
            header('Content-Type: text/html; charset='. self::CHARSET);
            echo $this->getContent(self::URL_ROOT);
        }
    }

    function __destruct()
    {
        unset($maGetPostData, $msGets);
    }

    /**
     * 载入POST数据
     * @return bool
     * */
    private function getPOST()
    {
        $handle = @fopen('php://input', 'r');
        $data = '';
        do
        {
            $data = @fread($handle, 1024);
            if (strlen($data) == 0)
                break;
            else
                $this->maGetPostData[] = $data;
        }while(true);
        fclose($handle);
        unset($data, $handle);
        return count($this->maGetPostData) >= 1;
    }

    /**
     * 载入GET数据
     * @return bool
     * */
    private function getGET()
    {
        /*取得GET内容*/
        if (count($_GET) > 0)
        {
            $aTmp = array();
            foreach ($_GET as $sKey => $sVal)
                $aTmp[] = $sKey .'='. urlencode($sVal);
            $this->msGets = implode('&', $aTmp);
            return true;
        }
        else
            return false;
    }

    /**
     * 读取远程接口返回的内容
     * @return string
     * */
    private function getContent($sGetUrl)
    {
        /**/
        $ch = curl_init();
        curl_setopt ($ch, CURLOPT_URL, $sGetUrl); //设置GET的URL地址
        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);//将结果保存成字符串
        curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 10);//连接超时时间s
        curl_setopt ($ch, CURLOPT_TIMEOUT, 10);//执行超时时间s
        curl_setopt ($ch, CURLOPT_DNS_CACHE_TIMEOUT, 1800);//DNS解析缓存保存时间半小时
        curl_setopt($ch, CURLOPT_HEADER,0);//丢掉头信息
        if (count($this->maGetPostData) > 0)
        {	//存在POST数据需要提交
            curl_setopt($ch, CURLOPT_POST, 1); //启用POST数据
            curl_setopt($ch, CURLOPT_POSTFIELDS, implode('', $this->maGetPostData));//提交POST数据
        }
        $sData = curl_exec($ch);
        curl_close($ch);
        unset($ch);
        return $sData;
    }
}

$o = new interface_relay();
unset($o);
?>