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Posts Tagged ‘wordpress’

FIX: WordPress Older Posts not working in IIS with Permalinks

April 28th, 2010 2 comments

I spent some time tweaking my blog today after moving it to some fresh hardware. You may find that everything is loading much faster now which can be attributed to two plugins in addition to the hardware upgrade – wp-super-cache and wp-widget-cache.

I’ve also fixed a long standing bug with my particular configuration of WordPress that runs on IIS which causes the “Older posts” link at the bottom does not function for the second page. The WordPress generated URL for this is

http://www.thushanfernando.com/index.php/Index.php/page/2

Which is a bit problematic, this ofcourse can be reproduced only on IIS from my musings (serves me right eh?). There are a couple of suggestions by people on the forums already, but I wasn’t too keen on them as they seemed too high-level fixes.

I’ve enabled Permalinks with this format:

http://www.thushanfernando.com/index.php/2010/04/28/sample-post/

So I looked through the sources to see why this was happening. After a bit of snooping about I got to the get_pagenum_link function in wp-includes/link-template.php file.

Heres a bit of source for reference – this is with WordPress 2.9.2:

function get_pagenum_link($pagenum = 1) {
	global $wp_rewrite;

	$pagenum = (int) $pagenum;

	$request = remove_query_arg( 'paged' );

	$home_root = parse_url(get_option('home'));
	$home_root = ( isset($home_root['path']) ) ? $home_root['path'] : '';
	$home_root = preg_quote( trailingslashit( $home_root ), '|' );

	$request = preg_replace('|^'. $home_root . '|', '', $request);
	$request = preg_replace('|^/+|', '', $request);

	if ( !$wp_rewrite->using_permalinks() || is_admin() ) {
		$base = trailingslashit( get_bloginfo( 'home' ) );

		if ( $pagenum > 1 ) {
			$result = add_query_arg( 'paged', $pagenum, $base . $request );
		} else {
			$result = $base . $request;
		}
	} else {
		$qs_regex = '|\?.*?$|';
		preg_match( $qs_regex, $request, $qs_match );

		if ( !empty( $qs_match[0] ) ) {
			$query_string = $qs_match[0];
			$request = preg_replace( $qs_regex, '', $request );
		} else {
			$query_string = '';
		}

		$request = preg_replace( '|page/\d+/?$|', '', $request);
		$request = preg_replace( '|^index\.php|', '', $request);
		$request = ltrim($request, '/');

		$base = trailingslashit( get_bloginfo( 'url' ) );

	if ( $wp_rewrite->using_index_permalinks() && ( $pagenum > 1 || '' != $request ) )
		$base .= 'index.php/';

		if ( $pagenum > 1 ) {
			$request = ( ( !empty( $request ) ) ? trailingslashit( $request ) : $request ) . user_trailingslashit( 'page/' . $pagenum, 'paged' );
		}

		$result = $base . $request . $query_string;
	}

	$result = apply_filters('get_pagenum_link', $result);

	return $result;
}

This function (from reading through) essentially generates the links for the page numbers & page navigation taking into account Permalinks if configured. This is all fine and dandy for Unix hosts but for Windows, unfortunately this bit of code fails us.

...
$request = preg_replace( '|page/\d+/?$|', '', $request);
$request = preg_replace( '|^index\.php|', '', $request);
$request = ltrim($request, '/');
...

As the preg_replace is case sensitive, it will not replace the invalid Index.php that is seen on IIS. So the easiest fix is to tweak the regex pattern a little bit and tell it be case insensitive.

...
$request = preg_replace( '|page/\d+/?$|', '', $request);
$request = preg_replace( '/|^index\.php|/i', '', $request);
$request = ltrim($request, '/');
...

This will then generate the (invalid) urls and the preg_replace will remove any additional Index.php’s from the request URL as its already mentioned in the $base variable a few lines below:

...
if ( $wp_rewrite->using_index_permalinks() && ( $pagenum > 1 || '' != $request ) )
$base .= 'index.php/';
...

Once you make the change and upload the files, your “Older posts” will start working again. I’ll submit a patch to WordPress I’ve submitted a patch to WordPress Trac, now its just a wait and see what they say, in the meantime here’s a patch file if you don’t want to modify sources manually. If there any issues, post a comment 🙂

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Update since the last post…

April 15th, 2008 No comments

So many things have happened since the start of the year that I’ve not really bothered to update my old blog apart from when Windows Vista Service Pack 1 was released to testers.

I finally finished by undergrads in 2007 and graduated in March this year bringing to an end that chapter of my life, it kind of feels weird to realise that University is over – though I do plan on doing my masters soon (and by soon I mean within the next few years!). Earlier this year I also left Vividas, leaving me to take a well deserved (atleast thats what I keep telling myself) few months off getting acquainted with life again.

My aunt and my youngest cousin from Sri Lanka came for my graduation which was super-exciting considering it was their first visit. So we took them around Oz, I think we covered about 4000Km by car and about 2000km by plane. From the usual Canbera & Sydney (one by plane and the others in the car) to Mt. Gambier, Philip Island, Mildura, Bega, Echuca, Ballarat etc.

Next up (infact within a week) I’ll  be jetting away to Korea then Japan for a 6 week backpack around the country. Something I’ve always wanted to do, but never really had the time to take off work – so now that I’m unemployed (to a certain degree) its time to make the most of it!

Unless I manage to squeeze the old posts from the old blog into the new WordPress driven blog in the next few days, the next few posts will be about my trip. I’ll be taking my lappy (the lovely Dell M1330) with me to document my journey.

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