PHP获取网页内容的几种方法
方法1: 用file_get_contents以get方式获取内容 <?php $url='http://www.domain.com/?para=123'; $html= file_get_contents($url); echo$html; ?> 方法2:用file_get_contents函数,以post方式获取url <?php $url= 'http://www.domain.com/test.php?id=123'; $data= array('foo'=> 'bar'); $data= http_build_query($data); $opts= array( 'http'=> array( 'method'=> 'POST', 'header'=>"Content-type: application/x-www-form-urlencoded\r\n" . "Content-Length: " . strlen($data) . "\r\n", 'content'=> $data ) ); $ctx= stream_context_create($opts); $html= @file_get_contents($url,'',$ctx); 如果需要再传递cookie数据,则把 'header'=>"Content-type: application/x-www-form-urlencoded\r\n" . "Content-Length: " . strlen($data) . "\r\n", 修改为 'header'=>"Content-type: application/x-www-form-urlencoded\r\n" . "Content-Length: " . strlen($data) . "\r\n". "cookie:cookie1=c1;cookie2=c2\r\n"; 即可 方法3: 用fopen打开url, 以get方式获取内容 <?php $fp= fopen($url,'r'); $header= stream_get_meta_data($fp);//获取报头信息 while(!feof($fp)) { $result.= fgets($fp, 1024); } echo"url header: {$header} <br>": echo"url body: $result"; fclose($fp); ?> 方法4: 用fopen打开url, 以post方式获取内容 <?php $data= array('foo2'=> 'bar2','foo3'=>'bar3'); $data= http_build_query($data); $opts= array( 'http'=> array( 'method'=> 'POST', 'header'=>"Content-type: application/x-www-form-urlencoded\r\nCookie:cook1=c3;cook2=c4\r\n" . "Content-Length: " . strlen($data) . "\r\n", 'content'=> $data ) ); $context= stream_context_create($opts); $html= fopen('http://www.test.com/zzzz.php?id=i3&id2=i4','rb',false, $context); $w=fread($html,1024); echo$w; ?> 方法5:用fsockopen函数打开url,以get方式获取完整的数据,包括header和body <?php functionget_url ($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) { returnfalse; }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,$request); while(!@feof($fp)) { $result.= @fgets($fp, 1024); } fclose($fp); return$result; } } //获取url的html部分,去掉header functionGetUrlHTML($url,$cookie=false) { $rowdata= get_url($url,$cookie); if($rowdata) { $body=stristr($rowdata,"\r\n\r\n"); $body=substr($body,4,strlen($body)); return$body; } returnfalse; } ?> 方法6:用fsockopen函数打开url,以POST方式获取完整的数据,包括header和body <?php functionHTTP_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 $data foreach($dataas $key=>$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; } ?> 方法7:使用curl库,使用curl库之前,可能需要查看一下php.ini是否已经打开了curl扩展 <?php $ch= curl_init(); $timeout= 5; curl_setopt ($ch, CURLOPT_URL, 'http://www.domain.com/'); curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout); $file_contents= curl_exec($ch); curl_close($ch); echo$file_contents; ?>
这里收集了3种利用php获得网页源代码抓取网页内容的方法,我们可以根据实际需要选用。
1、使用file_get_contents获得网页源代码
这个方法最常用,只需要两行代码即可,非常简单方便。
参考代码:
- <?php
- $fh= file_get_contents('http://www.webkaka.com/');
- echo $fh;
- ?>
2、使用fopen获得网页源代码
这个方法用的人也不少,不过代码有点多。
参考代码:
- <?php
- $fh = fopen('http://www.webkaka.com/', 'r');
- if($fh){
- while(!feof($fh)) {
- echo fgets($fh);
- }
- }
- ?>
3、使用curl获得网页源代码
使用curl获得网页源代码的做法,往往是需要更高要求的人使用,例如当你需要在抓取网页内容的同时,得到网页header信息,还有ENCODING编码的使用,USERAGENT的使用等等。
参考代码一:
- <?php
- // 创建一个新cURL资源
- $ch = curl_init();
- // 设置URL和相应的选项
- curl_setopt($ch, CURLOPT_URL, "http://www.webkaka.com/");
- curl_setopt($ch, CURLOPT_HEADER, false);
- // 抓取URL并把它传递给浏览器
- $data = curl_exec($ch);
- echo $data;
- //关闭cURL资源,并且释放系统资源
- curl_close($ch);
- ?>
参考代码二:
- <?php
- $szUrl = "http://www.webkaka.com/";
- $UserAgent = 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.0.04506; .NET CLR 3.5.21022; .NET CLR 1.0.3705; .NET CLR 1.1.4322)';
- $curl = curl_init();
- curl_setopt($curl, CURLOPT_URL, $szUrl);
- curl_setopt($curl, CURLOPT_HEADER, 0); //0表示不输出Header,1表示输出
- curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
- curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
- curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
- curl_setopt($curl, CURLOPT_ENCODING, '');
- curl_setopt($curl, CURLOPT_USERAGENT, $UserAgent);
- curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
- $data = curl_exec($curl);
- echo $data;
- //echo curl_errno($curl); //返回0时表示程序执行成功 如何从curl_errno返回值获取错误信息