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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 | 
|---|---|
| 276 |  | 
| 277 | /** | 
| 278 |  * Fires in the middle of built-in meta box registration. | 
| 279 |  * | 
| 280 |  * @since 2.1.0 | 
| 281 |  * @deprecated 3.7.0 Use 'add_meta_boxes' instead. | 
| 282 |  * | 
| 283 |  * @param WP_Post $post Post object. | 
| 284 |  */ | 
| 285 | do_action( 'dbx_post_advanced', $post ); | 
| 286 |  | 
| 287 | // Allow the Discussion meta box to show up if the post type supports comments, | 
| 288 | // or if comments or pings are open. | 
| 289 | if ( comments_open( $post ) || pings_open( $post ) || post_type_supports( $post_type, 'comments' ) ) { | 
| 290 |      add_meta_box( 'commentstatusdiv', __( 'Discussion' ), 'post_comment_status_meta_box', null, 'normal', 'core' ); | 
| 291 | } | 
| 292 |  | 
| 293 | $stati = get_post_stati( array( 'public' => true ) ); | 
| 294 | if ( empty( $stati ) ) { |