怎么用PHP发送HTTP请求（转载）

本文转自：http://blog.snsgou.com/blog/161.html 

file_get_contents版本：

/**
 * 发送post请求
 * @param string $url 请求地址
 * @param array $post_data post键值对数据
 * @return string
 */
function send_post($url, $post_data) {

    $postdata = http_build_query($post_data);
    $options = array(
        'http' =>; array(
            'method' =>; 'POST',
            'header' =>; 'Content-type:application/x-www-form-urlencoded',
            'content' =>; $postdata,
            'timeout' =>; 15 * 60 // 超时时间（单位:s）
        )
    );
    $context = stream_context_create($options);
    $result = file_get_contents($url, false, $context);

    return $result;
}

使用如下：

post_data = array(
    'username' => 'stclair2201',
    'password' => 'handan'
);
send_post('http://blog.snsgou.com', $post_data);

实战经验：

当我利用上述代码给另一台服务器发送http请求时，发现，如果服务器处理请求时间过长，本地的PHP会中断请求，即所谓的超时中断，第一个怀疑的是PHP本身执行时间的超过限制，但想想也不应该，因为老早就按照这篇文章设置了“PHP执行时间限制”（【推荐】PHP上传文件大小限制大全 ），仔细琢磨，想想，应该是http请求本身的一个时间限制，于是乎，就想到了怎么给http请求时间限制搞大一点。。。。。。查看PHP手册，果真有个参数 “ timeout ”，默认不知道多大，当把它的值设大一点，问题得已解决，弱弱地做个笔记~~~

Socket版本:

/**
 * Socket版本
 * 使用方法：
 * $post_string = "app=socket&version=beta";
 * request_by_socket('blog.snsgou.com', '/restServer.php', $post_string);
 */
function request_by_socket($remote_server,$remote_path,$post_string,$port = 80,$timeout = 30) {
    $socket = fsockopen($remote_server, $port, $errno, $errstr, $timeout);
    if (!$socket) die("$errstr($errno)");
    fwrite($socket, "POST $remote_path HTTP/1.0");
    fwrite($socket, "User-Agent: Socket Example");
    fwrite($socket, "HOST: $remote_server");
    fwrite($socket, "Content-type: application/x-www-form-urlencoded");
    fwrite($socket, "Content-length: " . （strlen($post_string) + 8） . "");
    fwrite($socket, "Accept:*/*");
    fwrite($socket, "");
    fwrite($socket, "mypost=$post_string");
    fwrite($socket, "");
    $header = "";
    while ($str = trim(fgets($socket, 4096))) {
        $header .= $str;
    }

    $data = "";
    while (!feof($socket)) {
        $data .= fgets($socket, 4096);
    }

    return $data;
}

Curl版本:

/**
 * Curl版本
 * 使用方法：
 * $post_string = "app=request&version=beta";
 * request_by_curl('http://blog.snsgou.com/restServer.php', $post_string);
 */
function request_by_curl($remote_server, $post_string) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $remote_server);
    curl_setopt($ch, CURLOPT_POSTFIELDS, 'mypost=' . $post_string);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_USERAGENT, "snsgou.com's CURL Example beta");
    $data = curl_exec($ch);
    curl_close($ch);

    return $data;
}

Curl版本(2)

/**
 * 发送HTTP请求
 *
 * @param string $url 请求地址
 * @param string $method 请求方式 GET/POST
 * @param string $refererUrl 请求来源地址
 * @param array $data 发送数据
 * @param string $contentType 
 * @param string $timeout
 * @param string $proxy
 * @return boolean
 */
function send_request($url, $data, $refererUrl = '', $method = 'GET', $contentType = 'application/json', $timeout = 30, $proxy = false) {
    $ch = null;
    if('POST' === strtoupper($method)) {
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_HEADER,0 );
        curl_setopt($ch, CURLOPT_FRESH_CONNECT, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);
        curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
        if ($refererUrl) {
            curl_setopt($ch, CURLOPT_REFERER, $refererUrl);
        }
        if($contentType) {
            curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type:'.$contentType));
        }
        if(is_string($data)){
            curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        } else {
            curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
        }
    } else if('GET' === strtoupper($method)) {
        if(is_string($data)) {
            $real_url = $url. (strpos($url, '?') === false ? '?' : ''). $data;
        } else {
            $real_url = $url. (strpos($url, '?') === false ? '?' : ''). http_build_query($data);
        }

        $ch = curl_init($real_url);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type:'.$contentType));
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
        if ($refererUrl) {
            curl_setopt($ch, CURLOPT_REFERER, $refererUrl);
        }
    } else {
        $args = func_get_args();
        return false;
    }

    if($proxy) {
        curl_setopt($ch, CURLOPT_PROXY, $proxy);
    }
    $ret = curl_exec($ch);
    $info = curl_getinfo($ch);
    $contents = array(
            'httpInfo' => array(
                    'send' => $data,
                    'url' => $url,
                    'ret' => $ret,
                    'http' => $info,
            )
    );

    curl_close($ch);
    return $ret;
}

调用 WCF接口 的一个例子：$json = restRequest($r_url,'POST', json_encode($data));