Date::__construct()

557    public function __construct()558    {559        $this->day_pcre = '(' . implode('|', array_keys($this->day)) . ')';560        $this->month_pcre = '(' . implode('|', array_keys($this->month)) . ')';561 562        static $cache;563        if (!isset($cache[get_class($this)])) {564            $all_methods = get_class_methods($this);565 566            foreach ($all_methods as $method) {567                if (strtolower(substr($method, 0, 5)) === 'date_') {568                    $cache[get_class($this)][] = $method;569                }570            }571        }572 573        foreach ($cache[get_class($this)] as $method) {574            $this->built_in[] = $method;575        }576    }