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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 |
|---|---|
| 57 | require_once('admin-header.php'); |
| 58 | |
| 59 | if ( !current_user_can('edit_page', $page_ID) ) |
| 60 | die ( __('You are not allowed to edit this page.') ); |
| 61 | |
| 62 | include('edit-page-form.php'); |
| 63 | ?> |
| 64 | <div id='preview' class='wrap'> |
| 65 | <h2 id="preview-post"><?php _e('Page Preview (updated when page is saved)'); ?></h2> |
| 66 | <iframe src="<?php echo attribute_escape(apply_filters('preview_page_link', add_query_arg('preview', 'true', get_permalink($post->ID)))); ?>" width="100%" height="600" ></iframe> |
| 67 | </div> |
| 68 | <?php |
| 69 | break; |
| 70 | |
| 71 | case 'editattachment': |
| 72 | $page_id = $post_ID = (int) $_POST['post_ID']; |
| 73 | check_admin_referer('update-attachment_' . $page_id); |
| 74 | |
| 75 | // Don't let these be changed |