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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 |
|---|---|
| 197 | * |
| 198 | * @param int $attachment_id Attachment ID |
| 199 | * @param string $file File path for the attachment |
| 200 | * @return bool False on failure, true on success. |
| 201 | */ |
| 202 | function update_attached_file( $attachment_id, $file ) { |
| 203 | if ( !get_post( $attachment_id ) ) |
| 204 | return false; |
| 205 | |
| 206 | $file = apply_filters( 'update_attached_file', $file, $attachment_id ); |
| 207 | $file = _wp_relative_upload_path($file); |
| 208 | |
| 209 | return update_post_meta( $attachment_id, '_wp_attached_file', $file ); |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * Return relative path to an uploaded file. |
| 214 | * |
| 215 | * The path is relative to the current upload dir. |