WordPress开发手册:parent_dropdown()

函数原型

parent_dropdown( int $default_page, int $parent_page, int $level, int|WP_Post $post = null ): void|false

函数描述

是否弃用

未弃用

函数参数

$default_page
int
Optional

The default page ID to be pre-selected. Default 0.

$parent_page
int
Optional

The parent page ID. Default 0.

$level
int
Optional

Page depth level. Default 0.

$post
int|WP_Post
Optional

Post ID or WP_Post object.

Default: null

函数返回值

函数位置

函数源码

function parent_dropdown( $default_page = 0, $parent_page = 0, $level = 0, $post = null ) {
	global $wpdb;

	$post  = get_post( $post );
	$items = $wpdb->get_results(
		$wpdb->prepare(
			"SELECT ID, post_parent, post_title
			FROM $wpdb->posts
			WHERE post_parent = %d AND post_type = 'page'
			ORDER BY menu_order",
			$parent_page
		)
	);

	if ( $items ) {
		foreach ( $items as $item ) {
			// A page cannot be its own parent.
			if ( $post && $post->ID && (int) $item->ID === $post->ID ) {
				continue;
			}

			$pad      = str_repeat( ' ', $level * 3 );
			$selected = selected( $default_page, $item->ID, false );

			echo "\n\t<option class='level-$level' value='$item->ID' $selected>$pad " . esc_html( $item->post_title ) . '</option>';
			parent_dropdown( $default_page, $item->ID, $level + 1 );
		}
	} else {
		return false;
	}
}

源码链接

WordPress
Github

变更日志