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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 |
|---|---|
| 668 | * @return string HTML content to display gallery. |
| 669 | */ |
| 670 | function gallery_shortcode($attr) { |
| 671 | global $post, $wp_locale; |
| 672 | |
| 673 | static $instance = 0; |
| 674 | $instance++; |
| 675 | |
| 676 | // Allow plugins/themes to override the default gallery template. |
| 677 | $output = apply_filters('post_gallery', '', $attr); |
| 678 | if ( $output != '' ) |
| 679 | return $output; |
| 680 | |
| 681 | // We're trusting author input, so let's at least make sure it looks like a valid orderby statement |
| 682 | if ( isset( $attr['orderby'] ) ) { |
| 683 | $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] ); |
| 684 | if ( !$attr['orderby'] ) |
| 685 | unset( $attr['orderby'] ); |
| 686 | } |