FluentDOM\QualifiedName::setQName PHP Méthode

    private function setQName($name)
    {
        if (empty($name)) {
            throw new \UnexpectedValueException('Invalid QName: QName is empty.');
        } elseif (isset(self::$_cache[$name])) {
            $this->_prefix = self::$_cache[$name][0];
            $this->_localName = self::$_cache[$name][1];
            return;
        } elseif (FALSE !== ($position = strpos($name, ':'))) {
            list($prefix, $localName) = explode(':', $name, 2);
            $this->isNCName($prefix, 0, $name);
            $this->isNCName($name, $position + 1);
            $this->_prefix = $prefix;
            $this->_localName = $localName;
        } else {
            $this->isNCName($name);
            $this->_localName = $name;
        }
        if (count(self::$_cache) > self::$cacheLimit) {
            array_splice(self::$_cache, 0, self::$cacheLimit / 2);
        }
        self::$_cache[$name] = [$this->_prefix, $this->_localName];
    }