使用PHP模拟post提交数据

这也是个老生常谈的话题了，上午花了点时间把这个问题整理了一下。

一般来说用PHP来模拟post提交数据有三种方法，file_get_contents、curl和socket。

写了个公用函数，专门用来打印post数据：

<?php
function pr() {
    $params = func_get_args();
    foreach ($params as $key => $value) {
        echo "<pre>";
        print_r($value);
        echo "</pre>";
    }
}

先写一个post.php，用来接收post数据并打印出来：

<?php
require dirname(__FILE__)."/function.php";

if (isset($_POST) && !empty($_POST)) {
    pr($_POST);
} else {
    pr("NO POST DATA!");
}

下面是用file_get_contents来模拟post：

<?php
require dirname(__FILE__)."/function.php";

function file_get_contents_post($url, $post) {
    $options = array(
        "http" => array(
            "method" => "POST",
            // "content" => "name=caiknife&email=caiknife@gmail.com",
            "content" => http_build_query($post),
        ),
    );

    $result = file_get_contents($url, false, stream_context_create($options));

    return $result;
}

$data = file_get_contents_post("http://www.a.com/post/post.php", array("name"=>"caiknife", "email"=>"caiknife@gmail.com"));

var_dump($data);

很简单是吧？再来看看curl模拟post：

<?php
require dirname(__FILE__)."/function.php";

function curl_post($url, $post) {
    $options = array(
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_HEADER         => false,
        CURLOPT_POST           => true,
        CURLOPT_POSTFIELDS     => $post,
    );

    $ch = curl_init($url);
    curl_setopt_array($ch, $options);
    $result = curl_exec($ch);
    curl_close($ch);
    return $result;
}

$data = curl_post("http://www.a.com/post/post.php", array("name"=>"caiknife", "email"=>"caiknife@gmail.com"));

var_dump($data);

最后是用socket来模拟post：

<?php
require dirname(__FILE__)."/function.php";

function socket_post($url, $post) {
    $urls = parse_url($url);
    if (!isset($urls["port"])) {
        $urls["port"] = 80;
    }

    $fp = fsockopen($urls["host"], $urls["port"], $errno, $errstr);
    if (!$fp) {
        echo "$errno, $errstr";
        exit();
    }

    $post = http_build_query($post);
    $length = strlen($post);
    $header = <<<HEADER
POST {$urls["path"]} HTTP/1.1
Host: {$urls["host"]}
Content-Type: application/x-www-form-urlencoded
Content-Length: {$length}
Connection: close

{$post}
HEADER;

    fwrite($fp, $header);
    $result = "";
    while (!feof($fp)) {
        // receive the results of the request
        $result .= fread($fp, 512);
    }
    $result = explode("

", $result, 2);
    return $result[1];
}

$data = socket_post("http://www.a.com/post/post.php", array("name"=>"caiknife", "email"=>"caiknife@gmail.com"));

var_dump($data);

这三种方法最后看到的内容都是一样的，但是在是用socket的时候，发送header信息时必须要注意header的完整信息，比如content type和content length必须要有，connection: close和post数据之间要空一行，等等；而通过socket取得的内容是包含了header信息的，要处理一下才能获得真正的内容。