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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 |
|---|---|
| 2803 | |
| 2804 | clean_post_cache($post_ID); |
| 2805 | |
| 2806 | if ( isset($post_parent) && $post_parent < 0 ) |
| 2807 | add_post_meta($post_ID, '_wp_attachment_temp_parent', $post_parent, true); |
| 2808 | |
| 2809 | if ( $update) { |
| 2810 | do_action('edit_attachment', $post_ID); |
| 2811 | } else { |
| 2812 | do_action('add_attachment', $post_ID); |
| 2813 | } |
| 2814 | |
| 2815 | return $post_ID; |
| 2816 | } |
| 2817 | |
| 2818 | /** |
| 2819 | * Delete an attachment. |
| 2820 | * |
| 2821 | * Will remove the file also, when the attachment is removed. Removes all post |