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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 |
|---|---|
| 25 | require_once( ABSPATH . 'wp-admin/includes/meta-boxes.php' ); |
| 26 | |
| 27 | add_meta_box('linksubmitdiv', __('Save'), 'link_submit_meta_box', null, 'side', 'core'); |
| 28 | add_meta_box('linkcategorydiv', __('Categories'), 'link_categories_meta_box', null, 'normal', 'core'); |
| 29 | add_meta_box('linktargetdiv', __('Target'), 'link_target_meta_box', null, 'normal', 'core'); |
| 30 | add_meta_box('linkxfndiv', __('Link Relationship (XFN)'), 'link_xfn_meta_box', null, 'normal', 'core'); |
| 31 | add_meta_box('linkadvanceddiv', __('Advanced'), 'link_advanced_meta_box', null, 'normal', 'core'); |
| 32 | |
| 33 | /** This action is documented in wp-admin/edit-form-advanced.php */ |
| 34 | do_action( 'add_meta_boxes', 'link', $link ); |
| 35 | |
| 36 | /** |
| 37 | * Fires when link-specific meta boxes are added. |
| 38 | * |
| 39 | * @since 3.0.0 |
| 40 | * |
| 41 | * @param object $link Link object. |
| 42 | */ |
| 43 | do_action( 'add_meta_boxes_link', $link ); |