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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 |
|---|---|
| 29 | * |
| 30 | * @param int $attachment_id Attachment ID |
| 31 | * @param bool $unfiltered Whether to apply filters or not |
| 32 | * @return string The file path to the attached file. |
| 33 | */ |
| 34 | function get_attached_file( $attachment_id, $unfiltered = false ) { |
| 35 | $file = get_post_meta( $attachment_id, '_wp_attached_file', true ); |
| 36 | if ( $unfiltered ) |
| 37 | return $file; |
| 38 | return apply_filters( 'get_attached_file', $file, $attachment_id ); |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Update attachment file path based on attachment ID. |
| 43 | * |
| 44 | * Used to update the file path of the attachment, which uses post meta name |
| 45 | * '_wp_attached_file' to store the path of the attachment. |
| 46 | * |
| 47 | * @package WordPress |