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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 106 | $post_str = sprintf(__ngettext('%1$s <a href="%2$s" title="Posts">post</a>', '%1$s <a href="%2$s" title="Posts">posts</a>', $numposts), number_format_i18n($numposts), 'edit.php'); | 
| 107 | $comm_str = sprintf(__ngettext('%1$s <a href="%2$s" title="Comments">comment</a>', '%1$s <a href="%2$s" title="Comments">comments</a>', $numcomms), number_format_i18n($numcomms), 'edit-comments.php'); | 
| 108 | $cat_str  = sprintf(__ngettext('%1$s <a href="%2$s" title="Categories">category</a>', '%1$s <a href="%2$s" title="Categories">categories</a>', $numcats), number_format_i18n($numcats), 'categories.php'); | 
| 109 | $tag_str  = sprintf(__ngettext('%1$s tag', '%1$s tags', $numtags), number_format_i18n($numtags)); | 
| 110 | ?> | 
| 111 |  | 
| 112 | <p><?php printf(__('There are currently %1$s and %2$s, contained within %3$s and %4$s.'), $post_str, $comm_str, $cat_str, $tag_str); ?></p> | 
| 113 | </div> | 
| 114 |  | 
| 115 | <?php do_action('activity_box_end'); ?> | 
| 116 | </div> | 
| 117 |  | 
| 118 | <p><?php _e('Use these links to get started:'); ?></p> | 
| 119 |  | 
| 120 | <ul> | 
| 121 | <?php if ( current_user_can('edit_posts') ) : ?> | 
| 122 |      <li><a href="post-new.php"><?php _e('Write a post'); ?></a></li> | 
| 123 | <?php endif; ?> | 
| 124 |      <li><a href="profile.php"><?php _e('Update your profile or change your password'); ?></a></li> |