Anti-leech measures based on HTTP_REFERER in php (stream_context_create)

If you want to take measures to break through the Anti-leech protection, you need to consider using HTTP_REFERER. The corresponding variable in the PHP script is $ _ SERVER ['HTTP _ referer'], which stores the value of HTTP_REFERER.

Because direct access to the target URL resource has been blocked by the above anti-leech measures, we need a gateway-like device to obtain it. To put it bluntly, you can compile a PHP script that has packaged the HTTP header.

The following is a simple function implementation:
Copy codeThe Code is as follows:
Function getRemoteFile ($ url, $ refer = ''){
$ Option = array (
'Http' => array (
'Header' => "Referer: $ refer ")
);
$ Context = stream_context_create ($ option );
Return file_get_contents ($ url, false, $ context );
}

This is a simple function. Its function is to forge a Referer (using the stream_context_create function) and then obtain the data of the other party (using file_get_contents, You need to enable allow_url_fopen ).

If you want to be "complex", you can use the sockets extension, which is not covered here.

In addition, a regular function is provided to obtain the host name.
Copy codeThe Code is as follows:
Function getHost ($ url ){
$ Result = preg_match ('/^ http: \/([\ d | \ w | \.] +) \ //', $ url, $ matches );
If (sizeof ($ matches)> = 2 ){
Return $ matches [1];
} Else {
Return null;
}
}

Further extensions can be encapsulated into scripts, such as calling

Http: // 127.0.0.1/proxy. php? Url = http:// I .am/imgcan get some of the anti-leech links (and then use Javascript to replace all the image links ).