On Wed, 3 Oct 2007, Mark wrote:
> I'm currently fetching feeds about every hour (automatically in php)
> but sometimes there are no new updates in a feed for 2 hours. so no i
> wonder if it's possible to check the feed somehow to see if it changed
> since i last fetched it and if it's the case than download it like it
> should.. if it's not changed than just skip the download.
>
> Is this possible and how (with filemtime?)? i rather have a method
> that works in php 4 and 5 (i use php 5 but alot of hosts still don't).
If you use a socket request to get the url you get to see the headers
along with the file contents.
> cat fsockopen.php
#!/usr/bin/env php
<?php
$fp = fsockopen( 'destiney.com', 80, $errno, $errstr, 30 );
if( !$fp )
{
echo "$errstr ($errno)\n";
}
else
{
$out = "GET /rss HTTP/1.1\r\n";
$out .= "Host: destiney.com\r\n";
$out .= "Connection: Close\r\n\r\n";
fwrite( $fp, $out );
while( !feof( $fp ) )
echo fgets( $fp, 128 );
fclose( $fp );
}
This particular request currently yields this Last-Modified header:
Last-Modified: Fri, 21 Sep 2007 12:45:38 GMT
This will let you develop a local cache for the rss contents and
only update it when the remote file has changed.
--
Greg Donald
Cyberfusion Consulting
http://cyberfusionconsulting.com/
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