wp-includes/post.php:2408Determines whether a post type is considered "viewable".
$post_typestring|WP_Post_TypeboolOne hook fires while is_post_type_viewable() runs, in this order:
Filters whether a post type is considered "viewable".
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 );}Introduced in 4.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/post.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.