How to mark every 3rd post

My approach. No extra function, no filter. 🙂

<?php $GLOBALS['wpdb']->current_post = 0; ?>
<div <?php post_class( 0 === ++$GLOBALS['wpdb']->current_post % 3 ? 'third' : '' ); ?>>

Alternative:

<div <?php post_class( 0 === ++$GLOBALS['wpdb']->wpse_post_counter % 3 ? 'third' : '' ); ?>>

Related Posts:

  1. How to mark every 3rd post
  2. Count posts within a custom post type and specific taxonomy and terms?
  3. How to Display a List of Users Who Have Made at Least 1 Post?
  4. How to Display Network Post Count?
  5. How to cache a shortcode functions output?
  6. Count posts in category including child categories
  7. adding a custom css class to post
  8. Count singular post views automatically
  9. Set font size automatically according to number of words in post
  10. Network wide post count (WP Multisite)
  11. Odd/even class on article tag
  12. How to add padding between posts
  13. Redirect based on user post count
  14. Alternate custom content in the loop
  15. Show that current post is number X out of X
  16. Show the author’s count of total amount of posts assign to a custom taxonomy term
  17. Double count view in archive.php
  18. Count to how many categories a post belongs to
  19. Add Post Tags to Body Class
  20. Count total number across post types
  21. Count search results in heading
  22. How to hide first gallery for every post?
  23. Add a class to post title if a link ends with a certain extension
  24. Counter of posts ever posted – even deleted ones
  25. Display Published Posts Count for Certain Time Period
  26. How to make classes for posts?
  27. How can I get global $post to work for CPT and update user?
  28. Display Notification Bar on Header on Certain Post Count
  29. Show posts count for Categories and Tags in wp_nav_menu
  30. How to add category post count in main navigation menu [closed]
  31. Count number of posts of current month
  32. Add $values to post_class()
  33. Howto show comment count by post in post?
  34. Counter is skipping post when I still want it visible [closed]
  35. Every second post different class in blog view
  36. Count several post tags
  37. Get post number both in the loop and in the post
  38. How do I insert a after every 5 posts in a WordPress Loop that infinitely loads posts?
  39. Count the number of a post types associated with another post type
  40. How can I add a class to particular paragraphs in my post?
  41. Microformats in a single post – layout conflict
  42. Echo the number of posts being displayed
  43. wordpress add field to post_class
  44. Display amount of pending posts in back/front end
  45. Count user posts and store the number for later use
  46. why the posts queried from sql is more than those showed on the page?
  47. Count the total views of all user posts published
  48. Author post count in category
  49. Set post title font size automatically according to number of words in post title
  50. Show post count in custom taxonomy page
  51. Count singular post views automatically
  52. How to count posts in tags within time limit
  53. Display Custom Post Category Count & WordPress Category Count Using Shortcode
  54. Counting Posts by Category
  55. Display number of post published every day
  56. Retrieve posts inside foundation tabs and tab-content split by 3 per row
  57. Alternative content between posts no repetition
  58. count_posts to a standalone link
  59. How to control Post view count incresing in sidebar widget posts too?
  60. Add a minimum word count to Excerpt (and how to force Excerpt as a rule for WyPiekacz)
  61. How to limit the number of posts a user can publish based on user type
  62. ho can I get the number of the current post instead of the post id?
  63. post_count not working
  64. Adding Count Post in Page
  65. Count words for all posts by all authors
  66. Word count for all posts of all authors
  67. Display post count on archive page in reverse order
  68. How to get total posts count for each date?
  69. Comment count next to post title?
  70. WordPress is creating a lot of draft posts
  71. Grab next post title in archive page
  72. How do I control the fallback query after the original query returned cero posts?
  73. Checking if some condition is matched before inserting post into database
  74. Can’t seem to replicate permalink structure for localhost development site
  75. Newly created category does not show category
  76. Shortcode for printing post titles
  77. how to create cron that post events daily in wordpress?
  78. Show category post with excerpt text
  79. Post of a specific category – not to be seen in paging previous/next post
  80. $post->ID not working
  81. Authentication over CURL
  82. How to show main category related to that post
  83. WordPress rewrite url help needed
  84. How to Add Wrapper to Infinite Scroll Javascript?
  85. Permalink of some posts change
  86. Post not showing up sometimes on website
  87. Have latest post and recent posts display differently
  88. Removing a post from the results of a WP Query
  89. Extra field in wp_post instead of postmeta
  90. 3rd Party Login in wordpress
  91. Same sidebar in all posts as in the category
  92. Add wp-link-pages to post
  93. Voting System, database connections?
  94. Adding The Post Template Dropdown to WP-Admin
  95. Fixing my display pending posts
  96. Where should get_post_meta() go to get $post->ID get_post_meta() is empty and $post->ID & get_the_id() are working
  97. wordpress paginate, link to the right page
  98. Posts page template: How can I edit the markup for this?
  99. 2nd post different layout
  100. Print all content of a paged post
Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)