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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 |
|---|---|
| 2846 | } else { |
| 2847 | |
| 2848 | /** |
| 2849 | * Fires before a comment is posted. |
| 2850 | * |
| 2851 | * @since 2.8.0 |
| 2852 | * |
| 2853 | * @param int $comment_post_ID Post ID. |
| 2854 | */ |
| 2855 | do_action( 'pre_comment_on_post', $comment_post_ID ); |
| 2856 | |
| 2857 | } |
| 2858 | |
| 2859 | // If the user is logged in |
| 2860 | $user = wp_get_current_user(); |
| 2861 | if ( $user->exists() ) { |
| 2862 | if ( empty( $user->display_name ) ) { |
| 2863 | $user->display_name=$user->user_login; |
| 2864 | } |