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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 |
|---|---|
| 4308 | } else { |
| 4309 | |
| 4310 | /** |
| 4311 | * Fires once an attachment has been added. |
| 4312 | * |
| 4313 | * @since 2.0.0 |
| 4314 | * |
| 4315 | * @param int $post_ID Attachment ID. |
| 4316 | */ |
| 4317 | do_action( 'add_attachment', $post_ID ); |
| 4318 | } |
| 4319 | |
| 4320 | return $post_ID; |
| 4321 | } |
| 4322 | |
| 4323 | if ( $update ) { |
| 4324 | /** |
| 4325 | * Fires once an existing post has been updated. |
| 4326 | * |