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How to determine if Previous Post or Next Post exist in Wordpress?

Posted on 2014-10-27
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Last Modified: 2014-11-06
In a Wordpress blog, I needed a way for a post to be able to determine if there's either a previous post or a next post that exist before or after it.

I've got a way to do it, but it seems unnecessarily complex and I was just wondering if someone had a more elegant way to accomplish the same thing?

Here's the example of how I'm currently determining if a previous post exists:
if (strlen(get_previous_post()->post_title) > 0)

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Question by:Brian Matis
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7 Comments
 
LVL 25

Accepted Solution

by:
James Rodgers earned 500 total points
ID: 40408219
you can do this instead

if (get_previous_post()){
// do true
}else{
//do false
}

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the get_previous_post and get_next_post functions return Post object if successful. Null if global $post is not set. Empty string if no corresponding post exists.
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LVL 6

Author Comment

by:Brian Matis
ID: 40408950
Thanks! I'll give this a try when I get a chance, but I seem to recall trying something like this at first and having a problem because the empty string didn't actually evaluate to false.
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LVL 15

Expert Comment

by:eemit
ID: 40412974
See how it is done in Twenty Fourteen Theme:

/**
 * Display navigation to next/previous post when applicable.
 *
 * @since Twenty Fourteen 1.0
 */
function twentyfourteen_post_nav() {
	// Don't print empty markup if there's nowhere to navigate.
	$previous = ( is_attachment() ) ? get_post( get_post()->post_parent ) : get_adjacent_post( false, '', true );
	$next     = get_adjacent_post( false, '', false );

	if ( ! $next && ! $previous ) {
		return;
	}

...

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LVL 6

Author Comment

by:Brian Matis
ID: 40419797
Sorry, still haven't had a chance to go and try this out. Should be able to some evening this week and then I'll report back on how it goes.
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LVL 25

Expert Comment

by:James Rodgers
ID: 40419805
no worries, let us know if you need anything else.
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LVL 6

Author Closing Comment

by:Brian Matis
ID: 40426986
Yep, Jester_48's solution totally worked! I must have done something wrong when I had first tried a similar solution. Now my code is much cleaner. Thanks!
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LVL 25

Expert Comment

by:James Rodgers
ID: 40427031
glad I could help.
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