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PHP 获取远程网页内容的代码(fopen,curl已测)

Jun 13, 2016 pm 12:08 PM
curl fopen php code use content copy of Web page Obtain Remotely

1、fopen的使用

复制代码 代码如下:


$handle = fopen ("http://s.jb51.net/", "rb");
$contents = "";
while (!feof($handle)) {
$contents .= fread($handle, 8192);
}
fclose($handle);
echo $contents; //输出获取到得内容。
?>


复制代码 代码如下:


// 对 PHP 5 及更高版本可以使用下面的代码
$handle = fopen("http://s.jb51.net", "rb");
$contents = stream_get_contents($handle);
fclose($handle);
echo $contents;
?>


但上面的代码容易出现 failed to open stream: HTTP request failed!错误,解决方法

有人说在php.ini中,有这样两个选项:allow_url_fopen =on(表示可以通过url打开远程文件),user_agent="PHP"(表示通过哪种脚本访问网络,默认前面有个 " ; " 去掉即可。)重启服务器。
但是有些还是会有这个警告信息,想用完美的解决还差一步,还得设置php.ini里面的user_agent,php默认的user_agent是PHP,我们把它改成Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)来模拟浏览器就可以了

user_agent="Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)"

在工作中遇到这个问题,后完美解决,故分享给大家。
2、通过curl来实现

复制代码 代码如下:


$url = "http://s.jb51.net";
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT,10);
$dxycontent = curl_exec($ch);
echo $dxycontent;
?>



linux下可以使用下面的代码下载
exec("wget {$url}");

PHP抓取外部资源函数fopen / file_get_contents / curl 的区别

fopen / file_get_contents 每次请求都会重新做DNS查询,并不对DNS信息进行缓存。
但是CURL会自动对DNS信息进行缓存。对同一域名下的网页或者图片的请求只需要一次DNS查询。
这大大减少了DNS查询的次数。
所以CURL的性能比fopen / file_get_contents 好很多。

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