function curl_get($url, $params) {

    return curl_http($url, $params, 'GET');

}

function curl_post($url, $params) {

    return curl_http($url, $params, 'POST');

}

function curl_http($url, $params, $method = 'GET', $header = array(), $multi = false){

    $opts = array(

            CURLOPT_TIMEOUT        => 30,

            CURLOPT_RETURNTRANSFER => 1,

            CURLOPT_SSL_VERIFYPEER => false,

            CURLOPT_SSL_VERIFYHOST => false,

            CURLOPT_HTTPHEADER     => $header

    );

    /* 根据请求类型设置特定参数 */

    switch(strtoupper($method)){

        case 'GET':

            $opts[CURLOPT_URL] = $url . '?' . http_build_query($params);

            break;

        case 'POST':

            //判断是否传输文件

            $params = $multi ? $params : http_build_query($params);

            $opts[CURLOPT_URL] = $url;

            $opts[CURLOPT_POST] = 1;

            $opts[CURLOPT_POSTFIELDS] = $params;

            break;

        default:

            throw new Exception('不支持的请求方式！');

    }

    /* 初始化并执行curl请求 */

    $ch = curl_init();

    curl_setopt_array($ch, $opts);

    $data  = curl_exec($ch);

    $error = curl_error($ch);

    curl_close($ch);

    if($error) throw new Exception('请求发生错误：' . $error);

    return  $data;

}