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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 |
|---|---|
| 221 | |
| 222 | /** |
| 223 | * Filter the path to the attached file to update. |
| 224 | * |
| 225 | * @since 2.1.0 |
| 226 | * |
| 227 | * @param string $file Path to the attached file to update. |
| 228 | * @param int $attachment_id Attachment ID. |
| 229 | */ |
| 230 | $file = apply_filters( 'update_attached_file', $file, $attachment_id ); |
| 231 | |
| 232 | if ( $file = _wp_relative_upload_path( $file ) ) |
| 233 | return update_post_meta( $attachment_id, '_wp_attached_file', $file ); |
| 234 | else |
| 235 | return delete_post_meta( $attachment_id, '_wp_attached_file' ); |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * Return relative path to an uploaded file. |