apply_filters( ‘wp_unique_post_slug_is_bad_hierarchical_slug’, bool $bad_slug, string $slug, string $post_type, int $post_parent )

Filters whether the post slug would make a bad hierarchical post slug.

Parameters

$bad_slugbool: Whether the post slug would be bad in a hierarchical post context.
$slugstring: The post slug.
$post_typestring: Post type.
$post_parentint: Post parent ID.

$is_bad_hierarchical_slug = apply_filters( 'wp_unique_post_slug_is_bad_hierarchical_slug', false, $slug, $post_type, $post_parent );

Used by	Description
wp_unique_post_slug()`wp-includes/post.php`	Computes a unique slug for the post, when given the desired slug and some post details.

Version	Description
3.1.0	Introduced.

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