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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 |
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326 |
|
327 | /** |
328 | * Filters the path to the attached file to update. |
329 | * |
330 | * @since 2.1.0 |
331 | * |
332 | * @param string $file Path to the attached file to update. |
333 | * @param int $attachment_id Attachment ID. |
334 | */ |
335 | $file = apply_filters( 'update_attached_file', $file, $attachment_id ); |
336 |
|
337 | if ( $file = _wp_relative_upload_path( $file ) ) |
338 | return update_post_meta( $attachment_id, '_wp_attached_file', $file ); |
339 | else |
340 | return delete_post_meta( $attachment_id, '_wp_attached_file' ); |
341 | } |
342 |
|
343 | /** |
344 | * Return relative path to an uploaded file. |