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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 |
|---|---|
| 177 | * @return string|bool The file path to the attached file, or false if the attachment does not exist. |
| 178 | */ |
| 179 | function get_attached_file( $attachment_id, $unfiltered = false ) { |
| 180 | $file = get_post_meta( $attachment_id, '_wp_attached_file', true ); |
| 181 | // If the file is relative, prepend upload dir |
| 182 | if ( $file && 0 !== strpos($file, '/') && !preg_match('|^.:\\\|', $file) && ( ($uploads = wp_upload_dir()) && false === $uploads['error'] ) ) |
| 183 | $file = $uploads['basedir'] . "/$file"; |
| 184 | if ( $unfiltered ) |
| 185 | return $file; |
| 186 | return apply_filters( 'get_attached_file', $file, $attachment_id ); |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * Update attachment file path based on attachment ID. |
| 191 | * |
| 192 | * Used to update the file path of the attachment, which uses post meta name |
| 193 | * '_wp_attached_file' to store the path of the attachment. |
| 194 | * |
| 195 | * @since 2.1.0 |