怎么用PHP发送HTTP请求（POST请求、GET请求）?

file_get_contents版本：

01    /**
02     * 发送post请求
03     * @param string $url 请求地址
04     * @param array $post_data post键值对数据
05     * @return string
06     */
07    function send_post($url, $post_data) {
08
09        $postdata = http_build_query($post_data);
10        $options = array(
11            'http' =>; array(
12                'method' =>; 'POST',
13                'header' =>; 'Content-type:application/x-www-form-urlencoded',
14                'content' =>; $postdata,
15                'timeout' =>; 15 * 60 // 超时时间（单位:s）
16            )
17        );
18        $context = stream_context_create($options);
19        $result = file_get_contents($url, false, $context);
20
21        return $result;
22    }

使用如下：

1    post_data = array(
2        'username' => 'stclair2201',
3        'password' => 'handan'
4    );
5    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:

01    /**
02     * Socket版本
03     * 使用方法：
04     * $post_string = "app=socket&version=beta";
05     * request_by_socket('blog.snsgou.com', '/restServer.php', $post_string);
06     */
07    function request_by_socket($remote_server,$remote_path,$post_string,$port = 80,$timeout = 30) {
08        $socket = fsockopen($remote_server, $port, $errno, $errstr, $timeout);
09        if (!$socket) die("$errstr($errno)");
10        fwrite($socket, "POST $remote_path HTTP/1.0");
11        fwrite($socket, "User-Agent: Socket Example");
12        fwrite($socket, "HOST: $remote_server");
13        fwrite($socket, "Content-type: application/x-www-form-urlencoded");
14        fwrite($socket, "Content-length: " . （strlen($post_string) + 8） . "");
15        fwrite($socket, "Accept:*/*");
16        fwrite($socket, "");
17        fwrite($socket, "mypost=$post_string");
18        fwrite($socket, "");
19        $header = "";
20        while ($str = trim(fgets($socket, 4096))) {
21            $header .= $str;
22        }
23
24        $data = "";
25        while (!feof($socket)) {
26            $data .= fgets($socket, 4096);
27        }
28
29        return $data;
30    }

Curl版本:

01    /**
02     * Curl版本
03     * 使用方法：
04     * $post_string = "app=request&version=beta";
05     * request_by_curl('http://blog.snsgou.com/restServer.php', $post_string);
06     */
07    function request_by_curl($remote_server, $post_string) {
08        $ch = curl_init();
09        curl_setopt($ch, CURLOPT_URL, $remote_server);
10        curl_setopt($ch, CURLOPT_POSTFIELDS, 'mypost=' . $post_string);
11        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
12        curl_setopt($ch, CURLOPT_USERAGENT, "snsgou.com's CURL Example beta");
13        $data = curl_exec($ch);
14        curl_close($ch);
15
16        return $data;
17    }

Curl版本(2)

01    /**
02     * 发送HTTP请求
03     *
04     * @param string $url 请求地址
05     * @param string $method 请求方式 GET/POST
06     * @param string $refererUrl 请求来源地址
07     * @param array $data 发送数据
08     * @param string $contentType
09     * @param string $timeout
10     * @param string $proxy
11     * @return boolean
12     */
13    function send_request($url, $data, $refererUrl = '', $method = 'GET', $contentType = 'application/json', $timeout = 30, $proxy = false) {
14        $ch = null;
15        if('POST' === strtoupper($method)) {
16            $ch = curl_init($url);
17            curl_setopt($ch, CURLOPT_POST, 1);
18            curl_setopt($ch, CURLOPT_HEADER,0 );
19            curl_setopt($ch, CURLOPT_FRESH_CONNECT, 1);
20            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
21            curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);
22            curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
23            if ($refererUrl) {
24                curl_setopt($ch, CURLOPT_REFERER, $refererUrl);
25            }
26            if($contentType) {
27                curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type:'.$contentType));
28            }
29            if(is_string($data)){
30                curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
31            } else {
32                curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
33            }
34        } else if('GET' === strtoupper($method)) {
35            if(is_string($data)) {
36                $real_url = $url. (strpos($url, '?') === false ? '?' : ''). $data;
37            } else {
38                $real_url = $url. (strpos($url, '?') === false ? '?' : ''). http_build_query($data);
39            }
40
41            $ch = curl_init($real_url);
42            curl_setopt($ch, CURLOPT_HEADER, 0);
43            curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type:'.$contentType));
44            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
45            curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
46            if ($refererUrl) {
47                curl_setopt($ch, CURLOPT_REFERER, $refererUrl);
48            }
49        } else {
50            $args = func_get_args();
51            return false;
52        }
53
54        if($proxy) {
55            curl_setopt($ch, CURLOPT_PROXY, $proxy);
56        }
57        $ret = curl_exec($ch);
58        $info = curl_getinfo($ch);
59        $contents = array(
60                'httpInfo' => array(
61                        'send' => $data,
62                        'url' => $url,
63                        'ret' => $ret,
64                        'http' => $info,
65                )
66        );
67
68        curl_close($ch);
69        return $ret;
70    }

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