do add_action on condition

Question

This snippet for example will email on EVERY post:

function email_friends( $post_ID )  
{
   $friends = 'bob@example.org, susie@example.org';
   wp_mail( $friends, "sally's blog updated", 'I just put something on my blog: http://blog.example.com' );

   return $post_ID;
}
add_action('publish_post', 'email_friends');

... whereas I just need add_action to run ONLY if the post is in category say "uncategorized", not any other category.

Thanks!

Answer 1

Use has_category() to check if a post belongs to a certain category.

function email_friends( $post_ID )  
{
    if ( has_category( 'uncategorized', $post_ID )
    {
        $friends = 'bob@example.org, susie@example.org';
        wp_mail( 
            $friends, 
            "sally's blog updated", 
            'I just put something on my blog: ' . get_permalink( $post_ID )
        );
    }
}
add_action('publish_post', 'email_friends');

And you don't need to return anything for an action handler.