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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 |
|---|---|
| 4105 | if ( $file ) |
| 4106 | update_attached_file( $post_ID, $file ); |
| 4107 | |
| 4108 | clean_post_cache( $post_ID ); |
| 4109 | |
| 4110 | if ( ! empty( $context ) ) |
| 4111 | add_post_meta( $post_ID, '_wp_attachment_context', $context, true ); |
| 4112 | |
| 4113 | if ( $update) { |
| 4114 | do_action('edit_attachment', $post_ID); |
| 4115 | } else { |
| 4116 | do_action('add_attachment', $post_ID); |
| 4117 | } |
| 4118 | |
| 4119 | return $post_ID; |
| 4120 | } |
| 4121 | |
| 4122 | /** |
| 4123 | * Trashes or deletes an attachment. |