Parser::split_ns( $string )

346    public function split_ns($string)347    {348        static $cache = [];349        if (!isset($cache[$string])) {350            if ($pos = strpos($string, $this->separator)) {351                static $separator_length;352                if (!$separator_length) {353                    $separator_length = strlen($this->separator);354                }355                $namespace = substr($string, 0, $pos);356                $local_name = substr($string, $pos + $separator_length);357                if (strtolower($namespace) === \SimplePie\SimplePie::NAMESPACE_ITUNES) {358                    $namespace = \SimplePie\SimplePie::NAMESPACE_ITUNES;359                }360 361                // Normalize the Media RSS namespaces362                if ($namespace === \SimplePie\SimplePie::NAMESPACE_MEDIARSS_WRONG ||363                    $namespace === \SimplePie\SimplePie::NAMESPACE_MEDIARSS_WRONG2 ||364                    $namespace === \SimplePie\SimplePie::NAMESPACE_MEDIARSS_WRONG3 ||365                    $namespace === \SimplePie\SimplePie::NAMESPACE_MEDIARSS_WRONG4 ||366                    $namespace === \SimplePie\SimplePie::NAMESPACE_MEDIARSS_WRONG5) {367                    $namespace = \SimplePie\SimplePie::NAMESPACE_MEDIARSS;368                }369                $cache[$string] = [$namespace, $local_name];370            } else {371                $cache[$string] = ['', $string];372            }373        }374        return $cache[$string];375    }