WP_Rewrite::init()

Source

public function init() {
	$this->extra_rules         = array();
	$this->non_wp_rules        = array();
	$this->endpoints           = array();
	$this->permalink_structure = get_option( 'permalink_structure' );
	$this->front               = substr( $this->permalink_structure, 0, strpos( $this->permalink_structure, '%' ) );
	$this->root                = '';

	if ( $this->using_index_permalinks() ) {
		$this->root = $this->index . '/';
	}

	unset( $this->author_structure );
	unset( $this->date_structure );
	unset( $this->page_structure );
	unset( $this->search_structure );
	unset( $this->feed_structure );
	unset( $this->comment_feed_structure );

	$this->use_trailing_slashes = str_ends_with( $this->permalink_structure, '/' );

	// Enable generic rules for pages if permalink structure doesn't begin with a wildcard.
	if ( preg_match( '/^[^%]*%(?:postname|category|tag|author)%/', $this->permalink_structure ) ) {
		$this->use_verbose_page_rules = true;
	} else {
		$this->use_verbose_page_rules = false;
	}
}

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