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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 |
|---|---|
| 676 | |
| 677 | if ( ! empty( $attr['ids'] ) ) { |
| 678 | // 'ids' is explicitly ordered, unless you specify otherwise. |
| 679 | if ( empty( $attr['orderby'] ) ) |
| 680 | $attr['orderby'] = 'post__in'; |
| 681 | $attr['include'] = $attr['ids']; |
| 682 | } |
| 683 | |
| 684 | // Allow plugins/themes to override the default gallery template. |
| 685 | $output = apply_filters('post_gallery', '', $attr); |
| 686 | if ( $output != '' ) |
| 687 | return $output; |
| 688 | |
| 689 | // We're trusting author input, so let's at least make sure it looks like a valid orderby statement |
| 690 | if ( isset( $attr['orderby'] ) ) { |
| 691 | $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] ); |
| 692 | if ( !$attr['orderby'] ) |
| 693 | unset( $attr['orderby'] ); |
| 694 | } |