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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 |
---|---|
4588 | } else { |
4589 |
|
4590 | /** |
4591 | * Fires once an attachment has been added. |
4592 | * |
4593 | * @since 2.0.0 |
4594 | * |
4595 | * @param int $post_ID Attachment ID. |
4596 | */ |
4597 | do_action( 'add_attachment', $post_ID ); |
4598 | } |
4599 |
|
4600 | return $post_ID; |
4601 | } |
4602 |
|
4603 | /** |
4604 | * Trashes or deletes an attachment. |
4605 | * |
4606 | * When an attachment is permanently deleted, the file will also be removed. |