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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 |
|---|---|
| 837 | $k = $prev ? $k - 1 : $k + 1; |
| 838 | |
| 839 | $output = $attachment_id = null; |
| 840 | if ( isset( $attachments[ $k ] ) ) { |
| 841 | $attachment_id = $attachments[ $k ]->ID; |
| 842 | $output = wp_get_attachment_link( $attachment_id, $size, true, false, $text ); |
| 843 | } |
| 844 | |
| 845 | $adjacent = $prev ? 'previous' : 'next'; |
| 846 | echo apply_filters( "{$adjacent}_image_link", $output, $attachment_id, $size, $text ); |
| 847 | } |
| 848 | |
| 849 | /** |
| 850 | * Retrieve taxonomies attached to the attachment. |
| 851 | * |
| 852 | * @since 2.5.0 |
| 853 | * |
| 854 | * @param int|array|object $attachment Attachment ID, Attachment data array, or Attachment data object. |
| 855 | * @return array Empty array on failure. List of taxonomies on success. |