is_post_type_viewable() │ WP 4.4.0

Determines whether a post type is considered "viewable".

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.

1 time — 0.000015 sec (very fast) | 50000 times — 0.04 sec (speed of light) | PHP 7.0.5, WP 4.4.2
Hooks from the function

Return

true|false. Whether the post type should be considered viewable.

Usage

is_post_type_viewable( $post_type );
$post_type(string|WP_Post_Type) (required)
Post type name or object.

Changelog

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

Code of is_post_type_viewable() WP 5.9.3

wp-includes/post.php 
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 );
}

Custom post type (post_type)

Custom Types