PHP下通过file_get_contents的代理使用方法
PHP使用file_get_contents的代理方法获取远程网页的代码。
复制代码 代码如下:
$url = "http://www.jb51.net/";
$ctx = stream_context_create(array(
'http' => array('timeout' => 5,
'proxy' => 'tcp://60.175.203.243:8080',
'request_fulluri' => True,)
)
);
$result = file_get_contents($url, False, $ctx);
echo $result;
?>
另外一种 curl 的方式使用代理的方法:
复制代码 代码如下:
function postPage($url)
{
$response = "";
$rd=rand(1,4);
$proxy='http://221.214.27.253:808';
if($rd==2) $proxy='http://222.77.14.56:8088';
if($rd==3) $proxy='http://202.98.123.126:8080';
if($rd==4) $proxy='http://60.14.97.38:8080';
if($url != "") {
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_PROXY, $proxy);
$response = curl_exec($ch);
if(curl_errno($ch)) $response = "";
curl_close($ch);
}
return $response;
}
用file_get_contents解决ajax垮域问题
在ajax运用中有时候会垮域调用文件,而浏览器为了安全会默认给这种操作提出警告,甚至直接阻止。如果是IE会弹出一个警告窗口,询问你是否继续操作,只有你同意了IE才会调用垮域的文件。而其它浏览器,如火狐、Opera默认设置下则会直接提示错误,阻止调用外域文件。这会给用户不好的操作体验,如果想通过用户修改浏览器的安全设置来解决这个问题是不现实的,最好是在服务器端解决。
在服务器端可以使用一个同域的文件做为代理文件,这个代理文件将获得外域文件的内容,然后再传递给ajax。这样ajax就不是调用外域文件,而是调用同域的这个代理文件,安全问题也就解决了。
如果你的服务器端支持PHP的话,可以使用file_get_contents这个函数,看到它的名称就已经知道它有获得其它文件内容的功能了。它的详细用法可以参看PHP官方网站上的file_get_contents用法一页,下面是它的简单实例。
复制代码 代码如下:
$serverAddress = 'http://s.jb51.net';
//获得外域文件内容
$randomNumber = file_get_contents($serverAddress);
//输出内容
echo $randomNumber;
?>

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