Previous post link with multiple custom taxonomies WordPress

Jayaram Y answers:

You can do something like this


$thisindex = array_search($post->ID, $ids);
$previd = $ids[$thisindex-1];
$nextid = $ids[$thisindex+1];
if ( !empty($previd) ) {
echo '<a rel="prev" href="' . get_permalink($previd). '">previous</a>';
}
if ( !empty($nextid) ) {
echo '<a rel="next" href="' . get_permalink($nextid). '">next</a>';
}


#2 solution
This goes in functions.php

function adjacent_post_by_category( $category, $direction, $content ) {

// Info
$postIDs = array();
$currentPost = get_the_ID();

// Get posts based on category
$postArray = get_posts( array(

'category' => $category,
'orderby'=>'post_date',
'order'=> 'DESC'
) );

// Get post IDs
foreach ( $postArray as $thepost ):
$postIDs[] = $thepost->ID;
endforeach;

// Get prev and next post ID
$currentIndex = array_search( $currentPost, $postIDs );
$prevID = $postIDs[ $currentIndex - 1 ];
$nextID = $postIDs[ $currentIndex + 1 ];

// Return information
if( $direction == 'next' AND $nextID ):
return '<a rel="next" href="' . get_permalink( $nextID ) . '">' . $content . '</a>';
elseif( $direction == 'prev' AND $prevID ):
return '<a rel="prev" href="' . get_permalink( $prevID ) . '">' . $content . '</a>';
else:
return false;
endif;
}

and where you want to call, you can use this

<?php echo adjacent_post_by_category( 10, 'prev', 'Show previous post' ); ?>

<?php echo adjacent_post_by_category( 10, 'next', 'Show next post' ); ?>


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mod mi answers:

I guess since you use the previous post link you are using this inside a single custom post type template? Please check this free plugin "Next/Previous Post Link Plus for Wordpress". It adds the functionality you describe among with other extensive options. http://www.ambrosite.com/plugins/next-previous-post-link-plus-for-wordpress

There is an "in_cats" option where you can specify either categories or taxonomy IDs. Check this part from the plugins options' documentation:

in_cats
Specifies the category IDs to include in the next/previous links; also works with custom taxonomies. Separate multiple category/taxonomy IDs with commas. This parameter overrides both in_same_cat and in_same_tax — if you list any category IDs here, the next/previous links for all posts will be drawn only from those categories you specify.

<?php next_post_link_plus( array('in_cats' => '3,5') ); ?>

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