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php获取网页内容方法总结

原文:php获取网页内容方法总结

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用php抓取页面的内容在实际的开发当中是非常有用的,如作一个简单的内容采集器,提取网页中的部分内容等等

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抓取到的内容在通过正则表达式做一下过滤就得到了你想要的内容,至于如何用正则表达式过滤,在这里就不做介绍了,有兴趣的,以下就是几种常用的用php抓取网页中的内容的方法。
1.file_get_contents
PHP代码

复制代码 代码如下:

$url = "http://www.jb51.net";
$contents = file_get_contents($url);
//如果出现中文乱码使用下面代码
//$getcontent = iconv("gb2312", "utf-8",$contents);
echo $contents;
?>


2.curl
PHP代码

复制代码 代码如下:

$url = "http://www.jb51.net";
$ch = curl_init();
$timeout = 5;
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
//在需要用户检测的网页里需要增加下面两行
//curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
//curl_setopt($ch, CURLOPT_USERPWD, US_NAME.":".US_PWD);
$contents = curl_exec($ch);
curl_close($ch);
echo $contents;
?>


3.fopen->fread->fclose
PHP代码

复制代码 代码如下:

$handle = fopen ("http://www.jb51.net", "rb");
$contents = "";
do {
$data = fread($handle, 1024);
if (strlen($data) == 0) {
break;
}
$contents .= $data;
} while(true);
fclose ($handle);
echo $contents;
?>


注:
1. 使用file_get_contents和fopen必须空间开启allow_url_fopen。方法:编辑php.ini,设置 allow_url_fopen = On,allow_url_fopen关闭时fopen和file_get_contents都不能打开远程文件。
2.使用curl必须空间开启curl。方法:windows下修改php.ini,将extension=php_curl.dll前面的分 号去掉,而且需要拷贝ssleay32.dll和libeay32.dll到C:\WINDOWS\system32下;Linux下要安装curl扩 展。

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