CURL-Post请求函数

/**
 * curl post请求函数
 *
 *
 * @url    请求的地址
 * @data   传输的数据
 * @json   是否json传输
 * @arr_header   请求头信息
 *
 * */
function http_request_post($url,$data = null,$json = false,$arr_header = null){
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
    if (!empty($data)){

        if ($json && is_array($data)) {
            $data = json_encode($data);
        }
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
    }
    if(!empty($arr_header)){
        curl_setopt($curl, CURLOPT_HTTPHEADER, $arr_header);
    }
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    $output = curl_exec($curl);
    // echo curl_getinfo($curl);
    curl_close($curl);
    unset($curl);
    return $output;
}