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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 |
---|---|
990 | * @since 2.5.0 |
991 | * @since 4.2.0 The `$instance` parameter was added. |
992 | * |
993 | * @see gallery_shortcode() |
994 | * |
995 | * @param string $output The gallery output. Default empty. |
996 | * @param array $attr Attributes of the gallery shortcode. |
997 | * @param int $instance Unique numeric ID of this gallery shortcode instance. |
998 | */ |
999 | $output = apply_filters( 'post_gallery', '', $attr, $instance ); |
1000 | if ( $output != '' ) { |
1001 | return $output; |
1002 | } |
1003 |
|
1004 | $html5 = current_theme_supports( 'html5', 'gallery' ); |
1005 | $atts = shortcode_atts( array( |
1006 | 'order' => 'ASC', |
1007 | 'orderby' => 'menu_order ID', |
1008 | 'id' => $post ? $post->ID : 0, |