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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 |
|---|---|
| 40 | * @param string $file {@internal Missing Description}} |
| 41 | * @return bool|mixed {@internal Missing Description}} |
| 42 | */ |
| 43 | function update_attached_file( $attachment_id, $file ) { |
| 44 | if ( !get_post( $attachment_id ) ) |
| 45 | return false; |
| 46 | |
| 47 | $old_file = get_attached_file( $attachment_id, true ); |
| 48 | |
| 49 | $file = apply_filters( 'update_attached_file', $file, $attachment_id ); |
| 50 | |
| 51 | if ( $old_file ) |
| 52 | return update_post_meta( $attachment_id, '_wp_attached_file', $file, $old_file ); |
| 53 | else |
| 54 | return add_post_meta( $attachment_id, '_wp_attached_file', $file ); |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * get_children() - Get post children |