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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 |
---|---|
3323 | } else { |
3324 |
|
3325 | /** |
3326 | * Fires once an attachment has been added. |
3327 | * |
3328 | * @since 2.0.0 |
3329 | * |
3330 | * @param int $post_ID Attachment ID. |
3331 | */ |
3332 | do_action( 'add_attachment', $post_ID ); |
3333 | } |
3334 |
|
3335 | return $post_ID; |
3336 | } |
3337 |
|
3338 | if ( $update ) { |
3339 | /** |
3340 | * Fires once an existing post has been updated. |
3341 | * |