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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 |
|---|---|
| 3467 | } else { |
| 3468 | |
| 3469 | /** |
| 3470 | * Fires once an attachment has been added. |
| 3471 | * |
| 3472 | * @since 2.0.0 |
| 3473 | * |
| 3474 | * @param int $post_ID Attachment ID. |
| 3475 | */ |
| 3476 | do_action( 'add_attachment', $post_ID ); |
| 3477 | } |
| 3478 | |
| 3479 | return $post_ID; |
| 3480 | } |
| 3481 | |
| 3482 | if ( $update ) { |
| 3483 | /** |
| 3484 | * Fires once an existing post has been updated. |
| 3485 | * |