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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 |
|---|---|
| 5024 | } else { |
| 5025 | |
| 5026 | /** |
| 5027 | * Fires once an attachment has been added. |
| 5028 | * |
| 5029 | * @since 2.0.0 |
| 5030 | * |
| 5031 | * @param int $post_id Attachment ID. |
| 5032 | */ |
| 5033 | do_action( 'add_attachment', $post_id ); |
| 5034 | } |
| 5035 | |
| 5036 | return $post_id; |
| 5037 | } |
| 5038 | |
| 5039 | if ( $update ) { |
| 5040 | /** |
| 5041 | * Fires once an existing post has been updated. |
| 5042 | * |