6 comments

1. is_home() checks for the “Posts Page”, despite the somewhat confusing function name.

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2. WordPress comes with 7 primary template page types, which can be determined on this way

   if ( is_main_query() ) {
       // Error
       if ( is_404() ) {
           ;
       }
       // Front page
       if ( is_front_page() ) {
           ;
       }
       // Archive
       if ( is_archive() ) {
           ;
       }
       // Comments popup
       if ( is_comments_popup() ) {
           ;
       }
       // Search
       if ( is_search() ) {
           ;
       }
       // Singular
       if ( is_singular() ) {
           ;
       }
       // Home - the blog page
       if ( is_home() ) {
           ;
       }
   }
   

   is_home tells to you, that you have the blog page.

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3. “Posts page” is usually an archive of:

   • posts of a category
   • posts of a tag
   • posts of a date ( year, month…)
   • posts of main archive

   Each one of these can be checked by a one of the many conditional tags like
   is_category()
is_tag()
is_date()
is_archive()
   And so many more. To get a better understanding head over to the codex http://codex.wordpress.org/Conditional_Tags

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4. First check the blogs related things like author, tag, post type

   function is_blog () {
           global  $post;
           $posttype = get_post_type($post );
           return ( ((is_archive()) || (is_author()) || (is_category()) || (is_home()) || (is_single()) || (is_tag())) && ( $posttype == 'post')  ) ? true : false ;
     }
   

   Now check and return something which you want to have

   function check_post_type(){
       $postType;
       if (is_blog())
         {
            $postType = 'I am post';
         } else
          {
             $postType = 'I am page';
          };
       return $postType;
     }
   

   Use it like Boss
   <?php echo check_post_type();?>

   Thanks to Wes Bos

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5. https://codex.wordpress.org/Conditional_Tags in WordPress Codex sais that you can reference pages like so:

   if ( is_front_page() && is_home() ) {
     // Default homepage
   } elseif ( is_front_page() ) {
     // static homepage
   } elseif ( is_home() ) {
     // blog page
   } else {
     //everything else
   }
   

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6. TL;DR

   Case A. There is no need to determine it inside the main template file (index.php) because it is the default template for it^[1].

   Case B. To determine it inside a page template (ex: page.php), simply check it like so:

   get_option( 'page_for_posts' ) == get_the_ID()
   

   Details

   I literally went digging the source-code^[2] of it just to be able to know how wordpress does the checking of the value. It turns out, it is using the statement get_option( 'page_for_posts' ) to know the post ID of the selected value of the Posts page.

   So yeah, for this purpose, there is no such official checker function that is similar to is_front_page().

   As long as you know the ID of the page that you’ve selected then you can use it for the checking process.

   References

   1. WordPress Codex, Theme Development, codex.wordpress.org/Theme_Development

   2. Source-code of Settings › Reading Settings, github.com/WordPress/…/wp-admin/options-reading.php

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