函数文档

is_post_type_viewable()

💡 云策文档标注

概述

is_post_type_viewable() 函数用于判断一个文章类型是否被视为“可查看”。对于内置文章类型(如 posts 和 pages),基于 'public' 属性评估;对于其他文章类型,则基于 'publicly_queryable' 属性评估。

关键要点

  • 函数接受字符串或 WP_Post_Type 对象作为参数,返回布尔值表示文章类型是否可查看。
  • 内置文章类型使用 'public' 属性,非内置文章类型使用 'publicly_queryable' 属性进行判断。
  • 函数内部逻辑:$is_viewable = $post_type->publicly_queryable || ( $post_type->_builtin && $post_type->public )。
  • 提供 'is_post_type_viewable' 过滤器,允许开发者自定义判断逻辑,但返回值必须为严格布尔类型以确保兼容性。
  • 函数在 WordPress 4.4.0 引入,后续版本增加了参数类型支持和过滤器钩子。

代码示例

add_filter( 'is_post_type_viewable', function ( $is_viewable, $post_type ) {
    if ( false == $is_viewable || 'sample_post_type' === $post_type->name ) {
        return false;
    }

    return true;
}, 10, 2 );

注意事项

过滤器返回值必须为布尔类型,非布尔值(即使是假值或真值)将导致函数返回 false,以避免 PHP 8.1+ 中的类型错误。


📄 原文内容

Determines whether a post type is considered “viewable”.

Description

For built-in post types such as posts and pages, the ‘public’ value will be evaluated.
For all others, the ‘publicly_queryable’ value will be used.

Parameters

$post_typestring|WP_Post_Typerequired
Post type name or object.

Return

bool Whether the post type should be considered viewable.

Source

function is_post_type_viewable( $post_type ) {
	if ( is_scalar( $post_type ) ) {
		$post_type = get_post_type_object( $post_type );

		if ( ! $post_type ) {
			return false;
		}
	}

	if ( ! is_object( $post_type ) ) {
		return false;
	}

	$is_viewable = $post_type->publicly_queryable || ( $post_type->_builtin && $post_type->public );

	/**
	 * Filters whether a post type is considered "viewable".
	 *
	 * The returned filtered value must be a boolean type to ensure
	 * `is_post_type_viewable()` only returns a boolean. This strictness
	 * is by design to maintain backwards-compatibility and guard against
	 * potential type errors in PHP 8.1+. Non-boolean values (even falsey
	 * and truthy values) will result in the function returning false.
	 *
	 * @since 5.9.0
	 *
	 * @param bool         $is_viewable Whether the post type is "viewable" (strict type).
	 * @param WP_Post_Type $post_type   Post type object.
	 */
	return true === apply_filters( 'is_post_type_viewable', $is_viewable, $post_type );
}

Hooks

apply_filters( ‘is_post_type_viewable’, bool $is_viewable, WP_Post_Type $post_type )

Filters whether a post type is considered “viewable”.

Changelog

Version Description
5.9.0 Added is_post_type_viewable hook to filter the result.
4.6.0 Converted the $post_type parameter to accept a WP_Post_Type object.
4.5.0 Added the ability to pass a post type name in addition to object.
4.4.0 Introduced.

User Contributed Notes