XMLWriter.php

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<?php
if (!defined('DATE_W3C')) {
  define('DATE_W3C', 'Y-m-d\TH:i:sP');
}

class PHPExcel_Shared_XMLWriter {
        const STORAGE_MEMORY    = 1;
        const STORAGE_DISK              = 2;

        private $_xmlWriter;

        private $_tempFileName = '';

    public function __construct($pTemporaryStorage = self::STORAGE_MEMORY, $pTemporaryStorageFolder = './') {
        // Create internal XMLWriter
        $this->_xmlWriter = new XMLWriter();

        // Open temporary storage
        if ($pTemporaryStorage == self::STORAGE_MEMORY) {
                $this->_xmlWriter->openMemory();
        } else {
                // Create temporary filename
                $this->_tempFileName = @tempnam($pTemporaryStorageFolder, 'xml');

                // Open storage
                if ($this->_xmlWriter->openUri($this->_tempFileName) === false) {
                        // Fallback to memory...
                        $this->_xmlWriter->openMemory();
                }
        }

        // Set default values
        $this->_xmlWriter->setIndent(true);
    }

    public function __destruct() {
        // Desctruct XMLWriter
        unset($this->_xmlWriter);

        // Unlink temporary files
        if ($this->_tempFileName != '') {
                @unlink($this->_tempFileName);
        }
    }

    public function getData() {
        if ($this->_tempFileName == '') {
                return $this->_xmlWriter->outputMemory(true);
        } else {
                $this->_xmlWriter->flush();
                return file_get_contents($this->_tempFileName);
        }
    }

    public function __call($function, $args) {
        try {
                @call_user_func_array(array($this->_xmlWriter, $function), $args);
        } catch (Exception $ex) {
                // Do nothing!
        }
    }

    public function writeRaw($text)
    {
        if (isset($this->_xmlWriter) && is_object($this->_xmlWriter) && (method_exists($this->_xmlWriter, 'writeRaw'))) {
            return $this->_xmlWriter->writeRaw(htmlspecialchars($text));
        }

        return $this->text($text);
    }
}