chavo

Ok. Assuming that “latest” category ID is = 1 and that you ONLY have the mentioned categories, please try with the code as follows.

In footer.php:

<?php
$this_category = get_category($cat);
if (is_category('latest')) {
$_SESSION['history'] =  "visitorComesFromLatest";
}
?>
<?php wp_footer(); ?>

In single.php:

<?php
if(isset($_SESSION['history'])){
if ($_SESSION['history'] == "visitorComesFromLatest") {
previous_post_link ('<span class="prev">%link</span>','PREV', false);
next_post_link ('<span class="next">%link</span>','NEXT', false);
}
} else {
previous_post_link ('<span class="prev">%link</span>','PREV', true);
next_post_link ('<span class="next">%link</span>','NEXT', true);
}
?>

php tags is correct.

I’m assuming you know about php code. Do you?

Tell me what’s the problem.

Mmmm… How are you managin your post? When you publish a post you check both parent and child category or only the child category?

In my example the “portfolio” session history have this name because I want to know if visitor comes from “portfolio” category. In your case, you can replace it by your own category.

In my case, this parameter ‘ex_cats’ => ‘9’ excludes the category “news” so I cant navigate through post in any portfolio posts (asigned to a portfolio subcategory).

In the default linking navigation the parameter TRUE tells navigation that you want to navigate between posts in same category.

So, to be clear:

If I came from home or portfolio (I display posts that belongs the portfolio subcategories in home page) > Allow posts navigation between posts in ANY portfolio subcategory.

If I came from a portfolio subcategory, navigate through posts in same subcategory.
edit: I notice that when I translated my code I left a piece of spanish code, so in your theme code in footer you have to replace
} else if ($_SESSION[‘history’] == “subcategoria portfolio”) {
with
} else if ($_SESSION[‘history’] == “portfolio subcategory”) {

By “enable history” I want to mean that you have to declare the session. In my case I call it “history”.

I hope to be clearer.

ps: once again, sorry for my “tarzan english”.

Hi. At this point (7 months later) I don’t remember really well but I think that I did it. Finally I decided to use another way to show my posts so I didn’t need this function anymore.

First, download and install this plugin:
Ambrosite Next/Previous Post Link Plus

Second, you need to know where you are coming from (home / category archive). To get this goal I decided to use sessions.

1) At functions.php you need to enable sessions to work. Put this code at the beggining of the file:

/**
 *    init_sessions()
 *
 *    @uses session_id()
 *    @uses session_start()
 */
function init_sessions() {
    if (!session_id()) {
        session_start();
    }
}
add_action('init', 'init_sessions');

2) Enable “history” (where you are coming from?). Put this code in footer.php before <?php wp_footer(); ?>

$this_category = get_category($cat) // get category ID;
if (is_home()) {
$_SESSION['history'] =  "home";
} else if (is_category('portfolio')) {
$_SESSION['history'] =  "portfolio";
} else if ($this_category->category_parent == 1) { // for "portfolio" child categories
$_SESSION['history'] =  "portfolio subcategory";
}

Now you have sessions working, you need to use conditional tags in single.php.

if(isset($_SESSION['history'])){ // if "history" session exists
if ($_SESSION['history'] == "home" || $_SESSION['history'] == "portfolio") { // if you come from home or portfolio, use prev/next links plus code
previous_post_link_plus(array('format' => '<span class="prev">%link</span>', 'link' => '« PREV', 'ex_cats' => '9'));
next_post_link_plus(array('format' => '<span class="prev">%link</span>', 'link' => 'NEXT »', 'ex_cats' => '9'));
} else if ($_SESSION['history'] == "subcategoria portfolio") { // if you come from a portfolio subcategory use native wordpress prev / next links
previous_post_link ('<span class="next">%link</span>','« PREV', TRUE);
next_post_link ('<span class="prev">%link</span>','NEXT »', TRUE);
}
} else { // if "history" doesn't exist use prev/next links plus code (maybe this code is not necessary)
previous_post_link_plus(array('format' => '<span class="prev">%link</span>', 'link' => '« PREV', 'ex_cats' => '9'));
next_post_link_plus(array('format' => '<span class="prev">%link</span>', 'link' => 'NEXT »', 'ex_cats' => '9'));
}

Well, like I said, I don’t remember really well if this worked ok (I think I get it but I’m not sure). Let me know if this works for you.

ps: sorry for my english.

Tiago, tú me enviaste el email. Estamos hablando en inglés pudiendo hablar tranquilamente en español. Posiblemente el plugin que mencionas hackea el calendario default o genera el propio y permite que se vean los títulos de los posts. No es un problema con Future posts me parece sino con cómo de genera el calendario por default (o quizás me esté faltando algún parámetro).

“future” status does really exist?

I use a plugin called “no future posts” to pull future posts.

You are welcome!