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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 | 
|---|---|
| 113 |      <p><?php _e('This will be shown when someone hovers over the link in the blogroll, or optionally below the link.'); ?></p> | 
| 114 | </div> | 
| 115 | </div> | 
| 116 | </div><!-- /post-body-content --> | 
| 117 |  | 
| 118 | <div id="postbox-container-1" class="postbox-container"> | 
| 119 | <?php | 
| 120 |  | 
| 121 | /** This action is documented in wp-admin/includes/meta-boxes.php */ | 
| 122 | do_action( 'submitlink_box' ); | 
| 123 | $side_meta_boxes = do_meta_boxes( 'link', 'side', $link ); | 
| 124 |  | 
| 125 | ?> | 
| 126 | </div> | 
| 127 | <div id="postbox-container-2" class="postbox-container"> | 
| 128 | <?php | 
| 129 |  | 
| 130 | do_meta_boxes(null, 'normal', $link); | 
| 131 |  |