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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 |
|---|---|
| 1568 | * @since 2.5.0 |
| 1569 | * @since 4.2.0 The `$instance` parameter was added. |
| 1570 | * |
| 1571 | * @see gallery_shortcode() |
| 1572 | * |
| 1573 | * @param string $output The gallery output. Default empty. |
| 1574 | * @param array $attr Attributes of the gallery shortcode. |
| 1575 | * @param int $instance Unique numeric ID of this gallery shortcode instance. |
| 1576 | */ |
| 1577 | $output = apply_filters( 'post_gallery', '', $attr, $instance ); |
| 1578 | if ( $output != '' ) { |
| 1579 | return $output; |
| 1580 | } |
| 1581 | |
| 1582 | $html5 = current_theme_supports( 'html5', 'gallery' ); |
| 1583 | $atts = shortcode_atts( array( |
| 1584 | 'order' => 'ASC', |
| 1585 | 'orderby' => 'menu_order ID', |
| 1586 | 'id' => $post ? $post->ID : 0, |