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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 |
|---|---|
| 51 | * |
| 52 | * @param int $attachment_id Attachment ID |
| 53 | * @param string $file File path for the attachment |
| 54 | * @return bool False on failure, true on success. |
| 55 | */ |
| 56 | function update_attached_file( $attachment_id, $file ) { |
| 57 | if ( !get_post( $attachment_id ) ) |
| 58 | return false; |
| 59 | |
| 60 | $file = apply_filters( 'update_attached_file', $file, $attachment_id ); |
| 61 | |
| 62 | return update_post_meta( $attachment_id, '_wp_attached_file', $file ); |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Retrieve all children of the post parent ID. |
| 67 | * |
| 68 | * Normally, without any enhancements, the children would apply to pages. In the |
| 69 | * context of the inner workings of WordPress, pages, posts, and attachments |