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Homephp教程php手册PHP抓取网页内容的方法

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,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,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代码如下:

<?php     
	$url = "http://www.phprm.com";  
	$contents = file_get_contents($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代码如下:

<?php 
	$url = "http://www.phprm.com";  
	$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代码如下:

<?php 
	$handle = fopen ("http://www.phprm.com", "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:WINDOWSsystem32下;Linux下要安装curl扩展。

方法一,安装cURL

wget http://curl.haxx.se/download/curl-7.17.1.tar.gz 
tar -zxf curl-7.17.1.tar.gz 
./configure --prefix=/usr/local/curl 
make & make install

安装php,只要打开开关 --with-curl=/usr/local/curl,就可以了,这个扩展库还是非常棒,是fsockopen等等相关的有效的替代品.

方法二,进入安装原php的源码目录.

cd ext
cd curl
phpize
./configure --with-curl=DIR
make & make install

就会在PHPDIR/ext/curl/moudles/下生成curl.so的文件,复制curl.so文件到extensions的配置目录,修改php.ini就好了.

extension=curl.so

第一种方法试了N遍一直在失败中,于是放弃,使用第二种方法安装,phpize提示找不到,其实命令在/usr/local/php/bin/目标下:

# /usr/local/php/bin/phpize

./configure --with-curl=DIR需要指定php的配置路径,应该如下:

# ./configure --with-php-config=/usr/local/php/bin/php-config --with-curl=DIR

注:上面的资料中错把--with-php-config写成了--with-php-php-config,然后就是编译安装:

# make

# make install

到这里会提示生成文件curl.so的路径: /usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/

进入到这个路径下,复制curl到extension_dir目录下(本目录路径可以看phpinfo可是直接看php.int).

修改php.ini

extension=curl.so
# /usr/local/php/bin/php -m

如果看到有curl项表示成功。

重启apache

# /usr/local/apache2/bin/apachectl stop
# /usr/local/apache2/bin/apachectl start

到此成功了,在phpinfo中可以看到CURL的项.

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