is_post_type_viewable │ filter-hook │ WP 5.9.0

Filters whether a post type is considered "viewable".

The returned filtered value must be a boolean type to ensure is_post_type_viewable() 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.

Usage

add_filter( 'is_post_type_viewable', 'wp_kama_is_post_type_viewable_filter', 10, 2 );

/**
 * Function for `is_post_type_viewable` filter-hook.
 * 
 * @param bool         $is_viewable Whether the post type is "viewable" (strict type).
 * @param WP_Post_Type $post_type   Post type object.
 *
 * @return bool
 */
function wp_kama_is_post_type_viewable_filter( $is_viewable, $post_type ){

	// filter...
	return $is_viewable;
}

$is_viewable(true|false)

Whether the post type is "viewable" (strict type).

$post_type(WP_Post_Type)

Post type object.

Changelog

Where the hook is called

return true === apply_filters( 'is_post_type_viewable', $is_viewable, $post_type );

Where the hook is used in WordPress