How to detect custom post type inside admin_init hook callback?

2 comments

1. This method is an easy one:

   /**
    * Based on http://wordpress.stackexchange.com/a/59999/12615
    */
   
   add_action( 'admin_head', 'wpse_59652_list_terms_exclusions' );
   
   function wpse_59652_list_terms_exclusions() {
       global $current_screen;
   
       if( 'post' != $current_screen->post_type )
           return;
   
       // Do your stuff
   }
   

   Another:

   /**
    * Based on http://wordpress.stackexchange.com/a/54279/12615
    */
   
   add_action( 'admin_notices', 'wpse_54258_display_error_message' );
   
   function wpse_54258_display_error_message() { 
       global $post;
       if( !isset( $post ) || 'page' != $post->post_type )
           return;
   
       ?>
           <div class="error fade">This is a "page" post type</div>
       <?php
   }
   

   And a complex one:

   /***
     * Conditional enqueue of scripts according to Admin page
    * Based on http://wordpress.stackexchange.com/a/9095/12615
    */
   
   add_action('admin_init', 'wpse_9080_admin_init');
   
   function wpse_9080_admin_init() {
       global $pagenow;
       global $firephp; // Using FirePHP for debugging - Remove if library not included
       if ( 'edit.php' == $pagenow) {
           if ( !isset($_GET['post_type']) ) {
               $firephp->log('I am the Posts listings page');  
           }
           elseif ( isset($_GET['post_type']) && 'page' == $_GET['post_type'] ) {
               // Will occur only in this screen: /wp-admin/edit.php?post_type=page
               $firephp->log('I am the Pages listings page');  
           }
       }
       if ('post.php' == $pagenow && isset($_GET['post']) ) {
           // Will occur only in this kind of screen: /wp-admin/post.php?post=285&action=edit
           // and it can be a Post, a Page or a CPT
           $post_type = get_post_type($_GET['post']);
           $firephp->log($post_type);
           if ( 'post' == $post_type ) {
               $firephp->log('I am editing a post');   
           }
           elseif ( 'page' == $post_type) {
               $firephp->log('I am editing a page');   
           }
           elseif ( 'movie' == $post_type) {
               $firephp->log('I am editing a custom post type');   
           }
       }
   
       if ('post-new.php' == $pagenow ) {
           // Will occur only in this kind of screen: /wp-admin/post-new.php
           // or: /wp-admin/post-new.php?post_type=page
           if ( !isset($_GET['post_type']) ) {
               $firephp->log('I am creating a new post');  
           }
           elseif ( isset($_GET['post_type']) && 'page' == $_GET['post_type'] ) {
               $firephp->log('I am creating a new page');  
           }
           elseif ( isset($_GET['post_type']) && 'movie' == $_GET['post_type'] ) {
               $firephp->log('I am creating a new custom post type');  
           }
       }   
   }
   

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2. Here is one function what you can use it with no problems.

   function admin_post_type () {
       global $post, $parent_file, $typenow, $current_screen, $pagenow;
   
       $post_type = NULL;
   
       if($post && (property_exists($post, 'post_type') || method_exists($post, 'post_type')))
           $post_type = $post->post_type;
   
       if(empty($post_type) && !empty($current_screen) && (property_exists($current_screen, 'post_type') || method_exists($current_screen, 'post_type')) && !empty($current_screen->post_type))
           $post_type = $current_screen->post_type;
   
       if(empty($post_type) && !empty($typenow))
           $post_type = $typenow;
   
       if(empty($post_type) && function_exists('get_current_screen'))
           $post_type = get_current_screen();
   
       if(empty($post_type) && isset($_REQUEST['post']) && !empty($_REQUEST['post']) && function_exists('get_post_type') && $get_post_type = get_post_type((int)$_REQUEST['post']))
           $post_type = $get_post_type;
   
       if(empty($post_type) && isset($_REQUEST['post_type']) && !empty($_REQUEST['post_type']))
           $post_type = sanitize_key($_REQUEST['post_type']);
   
       if(empty($post_type) && 'edit.php' == $pagenow)
           $post_type = 'post';
   
       return $post_type;
   }
   

   I made it to be flexibile, fast and accurate. You can expand it by your needs.

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