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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 |
---|---|
3529 | } else { |
3530 |
|
3531 | /** |
3532 | * Fires once an attachment has been added. |
3533 | * |
3534 | * @since 2.0.0 |
3535 | * |
3536 | * @param int $post_ID Attachment ID. |
3537 | */ |
3538 | do_action( 'add_attachment', $post_ID ); |
3539 | } |
3540 |
|
3541 | return $post_ID; |
3542 | } |
3543 |
|
3544 | if ( $update ) { |
3545 | /** |
3546 | * Fires once an existing post has been updated. |
3547 | * |