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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 |
|---|---|
| 1197 | $k = $prev ? $k - 1 : $k + 1; |
| 1198 | |
| 1199 | $output = $attachment_id = null; |
| 1200 | if ( isset( $attachments[ $k ] ) ) { |
| 1201 | $attachment_id = $attachments[ $k ]->ID; |
| 1202 | $output = wp_get_attachment_link( $attachment_id, $size, true, false, $text ); |
| 1203 | } |
| 1204 | |
| 1205 | $adjacent = $prev ? 'previous' : 'next'; |
| 1206 | echo apply_filters( "{$adjacent}_image_link", $output, $attachment_id, $size, $text ); |
| 1207 | } |
| 1208 | |
| 1209 | /** |
| 1210 | * Retrieve taxonomies attached to the attachment. |
| 1211 | * |
| 1212 | * @since 2.5.0 |
| 1213 | * |
| 1214 | * @param int|array|object $attachment Attachment ID, Attachment data array, or Attachment data object. |
| 1215 | * @return array Empty array on failure. List of taxonomies on success. |