Wordpress: get recent posts, delete the current category

Question

I've been trying to display recent posts for months excluding the current category. I have already researched on several forums and almost everything on StackOverflow and unfortunately I did not achieve success on my project.

I need help with the following functions:

My recent posts work normally. I can delete the current post and display all others.

What I would like to do is display all the latest posts excluding the current category.

Examples:

My categories: example1 / example2 / example3 /

Let's say the user is viewing this link:

Link 1 =

domain.com/category/example1/examplepost

In recent posts I would like to display the last 5 posts from the category "example2" and "example3".

Link 2 =

domain.com/category/example2/examplepost

In recent posts I would like to display the last 5 posts from the category "example1" and "example3".

I have the following code that I use in function.php

add_action('pre_get_posts', 'wpa_12345' );
function wpa_12345( $wp_query ) {
 $excluded = array(5);
 if( !is_admin() ) {
 $wp_query->set('category__not_in', $excluded);
 }
}
add_filter('pre_get_posts', 'exclude_category');

This code allows me to delete a category that I choose.

I would like some code that would automatically identify the current category to exclude from recent posts.

I followed Abhik user's guidelines ... See if the code was assembled correctly in functions.php

function wpa_12345( $wp_query ) {

 //Get the current category ID
 $catID = get_queried_object_id();

 //Pass it to the Query arguments
 $args = array(
 //Your other arguments here
 'category__not_in' => array($catID),
 );

 $excluded_posts = new WP_Query($args);

 if( !is_admin() ) {
 $wp_query->set('category__not_in', $excluded);
 }
}
add_filter('pre_get_posts', 'exclude_category');

Even reassembling the code, I didn't get what I expected.

Answer 1

Assuming you are using custom query to fetch the latest posts from other categories. In that case, you don't need to hook into pre_get_posts as the category__not_in parameter can be passed directly into the query arguments.

//Get the current category ID
$catID = get_queried_object_id();

//Pass it to the Query arguments
$args = array(
    //Your other arguments here
    'category__not_in' => array($catID),
);
$excluded_posts = new WP_Query($args);

EDIT

function wpse_exclude_current_cat( $query ) {
    if ( !is_admin() && !$query->is_main_query() ) {
        if ( is_category() ) {
            $catID = get_queried_object_id();
            $query->set( 'category__not_in', array($catID) );
        }
    }
}
add_action( 'pre_get_posts', 'wpse_exclude_current_cat' );