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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 |
|---|---|
| 537 | |
| 538 | /** |
| 539 | * Filters the path to the attached file to update. |
| 540 | * |
| 541 | * @since 2.1.0 |
| 542 | * |
| 543 | * @param string $file Path to the attached file to update. |
| 544 | * @param int $attachment_id Attachment ID. |
| 545 | */ |
| 546 | $file = apply_filters( 'update_attached_file', $file, $attachment_id ); |
| 547 | |
| 548 | $file = _wp_relative_upload_path( $file ); |
| 549 | if ( $file ) { |
| 550 | return update_post_meta( $attachment_id, '_wp_attached_file', $file ); |
| 551 | } else { |
| 552 | return delete_post_meta( $attachment_id, '_wp_attached_file' ); |
| 553 | } |
| 554 | } |
| 555 | |