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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 |
|---|---|
| 4974 | } else { |
| 4975 | |
| 4976 | /** |
| 4977 | * Fires once an attachment has been added. |
| 4978 | * |
| 4979 | * @since 2.0.0 |
| 4980 | * |
| 4981 | * @param int $post_id Attachment ID. |
| 4982 | */ |
| 4983 | do_action( 'add_attachment', $post_id ); |
| 4984 | } |
| 4985 | |
| 4986 | return $post_id; |
| 4987 | } |
| 4988 | |
| 4989 | if ( $update ) { |
| 4990 | /** |
| 4991 | * Fires once an existing post has been updated. |
| 4992 | * |