How to do some action weekly?

Question

For each new post, I add News category.

And I want to delete this category from each post after 7 days. I already know to "delete" the new category but how to run it every week ?

Answer 1

Did you try this plugin? http://wordpress.org/extend/plugins/scheduled-post-delete/

////

Sorry for my mistake, I understood you wrong. Try by pasting this in your functions.php:

function auto_cat_remove() {

    global $post;
    wp_schedule_single_event( time() + 604800, 'remove_news_cat_event', array( $post->ID ) );

}

function remove_news_cat_func( $post_id ) {
    global $wpdb;
    $category_id = get_cat_ID( 'news' );
    $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->term_relationships WHERE object_id = %d AND term_taxonomy_id = %d", $post_id, $category_id ) );
}

add_action( 'publish_post', 'auto_cat_remove' );
add_action( 'remove_news_cat_event', 'remove_news_cat_func' );

What this will do is basically schedule event seven days after the post creation. On 7th day, remove_news_cat_func function will run that will remove "news" category from the list of categories assigned to that post.

If you want to test it, you can change 604800 in wp_schedule_single_event to something like 30 and if you do that, 30 seconds after post creation category should be gone.

Note that this function relies on WP-Cron so to fire it, someone actually has to visit the site (this might cause delay with short span of 30 seconds but with days you are fine).

Answer 2

I found the solution. Thanks @OriginalEXE for the cron.

add_action( 'publish_post', 'auto_cat_remove' );
add_action( 'remove_news_cat_event', 'remove_cat_from_post' );

function auto_cat_remove() {
    global $post;
    wp_schedule_single_event( time() + 604800, 'remove_news_cat_event', array( $post->ID ) );
}

function remove_cat_from_post( $post_id ) {

    $term = 419; // Your cat ID
    $taxonomy = "category";

    if ( ! is_numeric( $term ) ) {
        $term = get_term( $term, $taxonomy );
        if ( ! $term || is_wp_error( $term ) )
           return false;
        $term_id = $term->term_id;
    } else {
        $term_id = $term;
    }

    // Get the existing terms and only keep the ones we don't want removed
    $new_terms = array();
    $current_terms = wp_get_object_terms( $post_id, $taxonomy, array( 'fields' => 'ids' ) );

    foreach ( $current_terms as $current_term ) {
       if ( $current_term != $term_id )
            $new_terms[] = intval( $current_term );
       }

    return wp_set_object_terms( $post_id, $new_terms, $taxonomy );
}