简洁版

function myPost($url, $jsonData)
{
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonData);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
            'Content-Type: application/json',
            'Content-Length: ' . strlen($jsonData)
        )
    );
    curl_setopt($ch, CURLOPT_PROXY, "127.0.0.1");
    curl_setopt($ch, CURLOPT_PROXYPORT, 8088);
    $output = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    return array($httpCode, $output);
}

完整版

function myPost($url, $jsonData)
{
    if (!function_exists('curl_init')) {
        echo 0;
        return '';
    }
    $curl = curl_init(); // 启动一个CURL会话
    curl_setopt($curl, CURLOPT_PROXY, '127.0.0.1:8088'); //设置代理 比如fiddler
    curl_setopt($curl, CURLOPT_URL, $url); // 要访问的地址
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0); // 对认证证书来源的检查
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 1); // 从证书中检查SSL加密算法是否存在
    //curl_setopt ( $curl, CURLOPT_USERAGENT, $GLOBALS ['user_agent'] ); // 模拟用户使用的浏览器
    //@curl_setopt ( $curl, CURLOPT_FOLLOWLOCATION, 1 ); // 使用自动跳转
    curl_setopt($curl, CURLOPT_AUTOREFERER, 1); // 自动设置Referer
    curl_setopt($curl, CURLOPT_POST, 1); // 发送一个常规的Post请求
    curl_setopt($curl, CURLOPT_POSTFIELDS, $jsonData); // Post提交的数据包
    //curl_setopt ( $curl, CURLOPT_COOKIEFILE, $GLOBALS ['cookie_file'] ); // 读取上面所储存的Cookie信息
    curl_setopt($curl, CURLOPT_TIMEOUT, 120); // 设置超时限制防止死循环
    curl_setopt($curl, CURLOPT_HEADER, 0); // 显示返回的Header区域内容
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); // 获取的信息以文件流的形式返回
    curl_setopt($curl, CURLOPT_HTTPHEADER, array(
            'Content-Type: application/json',
            'Content-Length: ' . strlen($jsonData)
        )
    );
    $tmpInfo = curl_exec($curl); // 执行操作
    $httpCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
    if (curl_errno($curl)) {
        echo 'Errno' . curl_error($curl);
    }
    curl_close($curl); // 关键CURL会话
    return array($httpCode, $tmpInfo); // 返回数据
}