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I currently have WordPress build an XML Sitemap everytime a POST or PAGE is PUBLISHED by using this Action...

add_action("publish_post", "create_news_sitemap");

I am not doing the same process but for a News Sitemap which has different criteria. Such as it can only show post that are no older then 48 hours.

I have my code working but I would like to optimize it slightly.

So when add_action("publish_post", "create_news_sitemap"); is ran, I would like to ONLY run a function is it is a Custom Post Type named news that is Publishing a post.

Is this something that is possible?

when the publish_post action is ran, can I detect which POST_TYPE is setting it into action?

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2 Answers 2

up vote 4 down vote accepted

publish_post will give you a second parameter if you ask for it. Notice the fourth parameter of the add_action call. That is your post object.

function run_on_publish_wpse_100421($postid,$post) { 
  if ('news' == $post->type) {
    // your code
  }
}
add_action('publish_post','run_on_publish_wpse_100421',1,2);
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The publish_post action gets the post ID as argument, pass that to get_post_type to find out what type of post it is:

function create_news_sitemap( $post_id ){
    $type = get_post_type( $post_id );
    if( 'news' == $type ){
        // do something
    }
}
add_action("publish_post", "create_news_sitemap");
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