php httpRequest(php实现httpRequest)

想从学校图书馆的网站上抓取数据处理之后在返回给浏览器，试了不少方法。首先试了http_request()，但是这个学院pecl_http支持，后来又试了网上流传甚广的class HttpRequest，可能是我不会使用，也失败了。后来看到了函数httpRequest($url, $post='', $method='GET', $limit=0, $returnHeader=FALSE, $cookie='', $bysocket=FALSE, $ip='', $timeout=15, $block=TRUE)，用它成功了，因此贴出来分享一下。函数代码如下：

<?php
	/**
	* Respose A Http Request
	*
	* @param string $url
	* @param array $post
	* @param string $method
	* @param bool $returnHeader
	* @param string $cookie
	* @param bool $bysocket
	* @param string $ip
	* @param integer $timeout
	* @param bool $block
	* @return string Response
	*/
	function httpRequest($url,$post='',$method='GET',$limit=0,$returnHeader=FALSE,$cookie='',$bysocket=FALSE,$ip='',$timeout=15,$block=TRUE) {
	   $return = '';
	   $matches = parse_url($url);

	   !isset($matches['host']) && $matches['host'] = '';
	   !isset($matches['path']) && $matches['path'] = '';
	   !isset($matches['query']) && $matches['query'] = '';
	   !isset($matches['port']) && $matches['port'] = '';

	   $host = $matches['host'];
	   $path = $matches['path'] ? $matches['path'].($matches['query'] ? '?'.$matches['query'] : '') : '/';
	   $port = !empty($matches['port']) ? $matches['port'] : 80;

	   if(strtolower($method) == 'post') {
		   $post = (is_array($post) and !empty($post)) ? http_build_query($post) : $post;
		   $out = "POST $path HTTP/1.0\r\n";
		   $out .= "Accept: */*\r\n";
		   //$out .= "Referer: $boardurl\r\n";
		   $out .= "Accept-Language: zh-cn\r\n";
		   $out .= "Content-Type: application/x-www-form-urlencoded\r\n";
		   $out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";
		   $out .= "Host: $host\r\n";
		   $out .= 'Content-Length: '.strlen($post)."\r\n";
		   $out .= "Connection: Close\r\n";
		   $out .= "Cache-Control: no-cache\r\n";
		   $out .= "Cookie: $cookie\r\n\r\n";
		   $out .= $post;
	   } else {
		   $out = "GET $path HTTP/1.0\r\n";
		   $out .= "Accept: */*\r\n";
		   //$out .= "Referer: $boardurl\r\n";
		   $out .= "Accept-Language: zh-cn\r\n";
		   $out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";
		   $out .= "Host: $host\r\n";
		   $out .= "Connection: Close\r\n";
		   $out .= "Cookie: $cookie\r\n\r\n";
	   }

	   $fp = fsockopen(($ip ? $ip : $host), $port, $errno, $errstr, $timeout);

	   if(!$fp) return ''; else {
		   $header = $content = '';

		   stream_set_blocking($fp, $block);
		   stream_set_timeout($fp, $timeout);
		   fwrite($fp, $out);
		   $status = stream_get_meta_data($fp);

		   if(!$status['timed_out']) {//未超时
			   while (!feof($fp)) {
				   $header .= $h = fgets($fp);
				   if($h && ($h == "\r\n" ||  $h == "\n")) break;
			   }

			   $stop = false;
			   while(!feof($fp) && !$stop) {
				   $data = fread($fp, ($limit == 0 || $limit > 8192 ? 8192 : $limit));
				   $content .= $data;
				   if($limit) {
					   $limit -= strlen($data);
					   $stop = $limit <= 0;
				   }
			   }
		   }
		fclose($fp);

		   return $returnHeader ? array($header,$content) : $content;
	   }
	}
?>

调用也很简单的。简单的例子：

echo httpRequest('http://www.baidu.com');