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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 | 
|---|---|
| 739 |  | 
| 740 |      if ( ! isset( $show_admin_bar ) ) { | 
| 741 |           if ( ! is_user_logged_in() || 'wp-login.php' == $pagenow ) { | 
| 742 |                $show_admin_bar = false; | 
| 743 |           } else { | 
| 744 |                $show_admin_bar = _get_admin_bar_pref(); | 
| 745 |           } | 
| 746 |      } | 
| 747 |  | 
| 748 |      $show_admin_bar = apply_filters( 'show_admin_bar', $show_admin_bar ); | 
| 749 |  | 
| 750 |      return $show_admin_bar; | 
| 751 | } | 
| 752 |  | 
| 753 | /** | 
| 754 |  * Retrieve the admin bar display preference of a user. | 
| 755 |  * | 
| 756 |  * @since 3.1.0 | 
| 757 |  * @access private |