使用PHP发送HTTP请求（POST请求、GET请求）

### file_get_content POST
```php
<?php
/**
     * 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);
```
注：使用上述代码给另一台服务器发送http请求时，发现服务器处理请求时间过长，本地的PHP就会中断请求，即所谓的超时中断。原因是http请求本身的时间限制，遂查看PHP手册，发现 “timeout” 参数，设置长一些的超时时间。

### file_get_content GET
```php
<?php
$url='http://www.domain.com/';
$html = file_get_contents($url);
echo $html;
?>
```

### 用fopen打开url, 以get方式获取内容 
```php
<?php  
$fp = fopen($url, 'r');  
//返回请求流信息（数组：请求状态，阻塞，返回值是否为空，返回值http头等）
stream_get_meta_data($fp);  
while(!feof($fp)) {  
	$result .= fgets($fp, 1024);  
}  
echo "url body: $result";  
fclose($fp);  
?>
```

### 方法4：用fsockopen函数打开url，以get方式获取完整的数据，包括header和body,fsockopen需要 PHP.ini 中 allow_url_fopen 选项开启
```php
<?php  
function get_url ($url,$cookie=false)  
{  
	$url = parse_url($url);  
	$query = $url[path]."?".$url[query];  
	echo "Query:".$query;  
	$fp = fsockopen( $url[host], $url[port]?$url[port]:80 , $errno, $errstr, 30);  
	if (!$fp) {  
		return false;  
	} else {  
		$request = "GET $query HTTP/1.1\r\n";  
		$request .= "Host: $url[host]\r\n";  
		$request .= "Connection: Close\r\n";  
		if($cookie) $request.="Cookie:   $cookie\n";  
		$request.="\r\n";  
		fwrite($fp,$request);  
		while()) {  
			$result .= @fgets($fp, 1024);  
		}  
		fclose($fp);  
		return $result;  
	}  
}  
//获取url的html部分，去掉header  
function GetUrlHTML($url,$cookie=false)  
{  
	$rowdata = get_url($url,$cookie);  
	if($rowdata)  
	{  
		$body= stristr($rowdata,"\r\n\r\n");  
		$body=substr($body,4,strlen($body));  
		return $body;  
	}  
	return false;  
}  
?>
```

### 方法5：用fsockopen函数打开url，以POST方式获取完整的数据，包括header和body 
```php
<?php  
function HTTP_Post($URL,$data,$cookie, $referrer="")  
{  
	// parsing the given URL  
	$URL_Info=parse_url($URL);  
	// Building referrer  
	if($referrer=="") // if not given use this script as referrer  
		$referrer="111";  
	// making string from $data  
	foreach($data as $key=>$value)  
		$values[]="$key=".urlencode($value);  
	$data_string=implode("&",$values);  
	// Find out which port is needed - if not given use standard (=80)  
	if(!isset($URL_Info["port"]))  
		$URL_Info["port"]=80;  
	// building POST-request:  
	$request.="POST ".$URL_Info["path"]." HTTP/1.1\n";  
	$request.="Host: ".$URL_Info["host"]."\n";  
	$request.="Referer: $referer\n";  
	$request.="Content-type: application/x-www-form-urlencoded\n";  
	$request.="Content-length: ".strlen($data_string)."\n";  
	$request.="Connection: close\n";  
	$request.="Cookie:   $cookie\n";  
	$request.="\n";  
	$request.=$data_string."\n";  
	$fp = fsockopen($URL_Info["host"],$URL_Info["port"]);  
	fputs($fp, $request);  
	while(!feof($fp)) {  
		$result .= fgets($fp, 1024);  
	}  
	fclose($fp);  
	return $result;  
}  
?>
```

### Socket版本
```php
/**
* 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
```php
/**
* 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
```php
/**
* 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;
}
```

### CURL post-get
```php
public function httpsSend($url, $params = array(), $method = 'get') {
	$ch = curl_init();
	if($method == 'get') {
		$sParm = http_build_query($params);
		if(!empty($sParm)) {
			$url = $url.'?'.$sParm;
		}
	} else {
		curl_setopt($ch, CURLOPT_POST, true);
		curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
	}

curl_setopt($ch, CURLOPT_URL, $url);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
	curl_setopt($ch, CURLOPT_TIMEOUT, 500);
	curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 60);
	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
	curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);

try {
		$response = curl_exec($ch);
		if(!$response) {
			$response = json_encode(array(
				'errcode'=>curl_errno($ch),
				'errmsg'=>curl_error($ch),
			));
		}
		curl_close($ch);
	} catch (Exception $e) {
		$response = json_encode(array());
	}

return json_decode($response, true);
}
```

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