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In my functions.php I have a function that allows me to place a "similar posts by categories":

functions.php:

function alep_related_posts_by_category() {  
global $post;  
// We should get the first category of the post  
$categories = get_the_category( $post->ID );  
$first_cat = $categories[0]->cat_ID;  

$args = array(  
    // It should be in the first category of our post:  
    'category__in' => array( $first_cat ),  
    // Our post should NOT be in the list:  
    'post__not_in' => array( $post->ID ),  
    'posts_per_page' => 3  
);  

$posts = get_posts( $args );  
if( $posts ) {  
    $output = '<div class="sidebar-entries">';  

    foreach( $posts as $post ) {  
        setup_postdata( $post );  
        $post_title = get_the_title();  
        $permalink = get_permalink();  
        $output .= '<p class="title clickablediv"><a href="' . $permalink . '" title="' . esc_attr( $post_title ) . '">' . $post_title . '</a></p>';  
    }  
    $output .= '</div>';  
} else {  

    $output .= '<p>Sorry, no other posts matched this category.</p>';  
}  
echo $output;  
}  

I have just found out that if I use this function together with <?php edit_post_link('Edit article', '<p>', '</p>'); ?> it will cause the "Edit post link" to link to the wrong post. I am not sure why these functions are related. I know that if I remove the function above, the edit_post_link will work fine.

So what is going on here? How can I fix this problem?

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Use the function wp_reset_postdata() after looping posts.I think this will solve your problem ...

Note : if you use setup_postdata() you do need to wp_reset_postdata() afterwards.

|improve this answer|||||
  • So I added wp_reset_postdata() after echo $output;. Is this what you meant? I mean does it matter where in the code I add it, as long as it is after setup_postdata()? – Arete Dec 14 '16 at 13:11

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