category_rewrite_rules wordpress.org
public function category_rewrite_rules() {
global $wp_rewrite;
$category_rewrite = [];
$taxonomy = get_taxonomy( 'category' );
$permalink_structure = get_option( 'permalink_structure' );
$blog_prefix = '';
if ( is_multisite() && ! is_subdomain_install() && is_main_site() && strpos( $permalink_structure, '/blog/' ) === 0 ) {
$blog_prefix = 'blog/';
}
$categories = get_categories( [ 'hide_empty' => false ] );
if ( is_array( $categories ) && $categories !== [] ) {
foreach ( $categories as $category ) {
$category_nicename = $category->slug;
if ( $category->parent === $category->cat_ID ) {
// Recursive recursion.
$category->parent = 0;
}
elseif ( $taxonomy->rewrite['hierarchical'] !== false && $category->parent !== 0 ) {
$parents = get_category_parents( $category->parent, false, '/', true );
if ( ! is_wp_error( $parents ) ) {
$category_nicename = $parents . $category_nicename;
}
unset( $parents );
}
$category_rewrite = $this->add_category_rewrites( $category_rewrite, $category_nicename, $blog_prefix, $wp_rewrite->pagination_base );
// Adds rules for the uppercase encoded URIs.
$category_nicename_filtered = $this->convert_encoded_to_upper( $category_nicename );
if ( $category_nicename_filtered !== $category_nicename ) {
$category_rewrite = $this->add_category_rewrites( $category_rewrite, $category_nicename_filtered, $blog_prefix, $wp_rewrite->pagination_base );
}
}
unset( $categories, $category, $category_nicename, $category_nicename_filtered );
}
// Redirect support from Old Category Base.
$old_base = $wp_rewrite->get_category_permastruct();
$old_base = str_replace( '%category%', '(.+)', $old_base );
$old_base = trim( $old_base, '/' );
$category_rewrite[ $old_base . '$' ] = 'index.php?wpseo_category_redirect=$matches[1]';
return $category_rewrite;
}
