wp-includes/class-wp-rewrite.php:1493Retrieves the rewrite rules.
string[] public function wp_rewrite_rules() { $this->rules = get_option( 'rewrite_rules' ); if ( empty( $this->rules ) ) { $this->refresh_rewrite_rules(); } return $this->rules; }Introduced in 1.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-rewrite.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.