function _initialize()
    {
        if ($this->_using_tmpfile == false) {
            return;
        }

        if ($this->_tmp_dir === '' && ini_get('open_basedir') === false) {
            // open_basedir restriction in effect - store data in memory
            // ToDo: Let the error actually have an effect somewhere
            $this->_using_tmpfile = false;  
            return new PEAR_Error('Temp file could not be opened since open_basedir restriction in effect - please use setTmpDir() - using memory storage instead');
        }

        // Open tmp file for storing Worksheet data
        if ($this->_tmp_dir === '') {
            $fh = tmpfile();
        } else {
            // For people with open base dir restriction
            $tmpfilename = tempnam($this->_tmp_dir, "Spreadsheet_Excel_Writer");
            $fh = @fopen($tmpfilename, "w+b");
        }

        if ($fh === false) {
            // If tmpfile() fails store data in memory
            $this->_using_tmpfile = false;
        } else {
            // Store filehandle
            $this->_filehandle = $fh;
        }
    }
function _initialize()
    {
        if ($this->_using_tmpfile == false) {
            return;
        }

        if ($this->_tmp_dir === '' && ini_get('open_basedir') === false) {
            // open_basedir restriction in effect - store data in memory
            // ToDo: Let the error actually have an effect somewhere
            $this->_using_tmpfile = false;  
            return new PEAR_Error('Temp file could not be opened since open_basedir restriction in effect - please use setTmpDir() - using memory storage instead');
        }

        // Open tmp file for storing Worksheet data
        if ($this->_tmp_dir === '') {
            $fh = tmpfile();
        } else {
            // For people with open base dir restriction
            $tmpfilename = tempnam($this->_tmp_dir, "Spreadsheet_Excel_Writer");
            $fh = @fopen($tmpfilename, "w+b");
        }

        if ($fh === false) {
            // If tmpfile() fails store data in memory
            $this->_using_tmpfile = false;
        } else {
            // Store filehandle
            $this->_filehandle = $fh;
        }
    }
function _initialize ( ) { if ( $ this -> _using_tmpfile == false ) { return ; } if ( $ this -> _tmp_dir === '' && ini_get ( 'open_basedir' ) === false ) { // open_basedir restriction in effect - store data in memory
 // ToDo: Let the error actually have an effect somewhere
 $ this -> _using_tmpfile = false ; return new PEAR_Error ( 'Temp file could not be opened since open_basedir restriction in effect - please use setTmpDir() - using memory storage instead' ) ; } // Open tmp file for storing Worksheet data
 if ( $ this -> _tmp_dir === '' ) { $ fh = tmpfile ( ) ; } else { // For people with open base dir restriction
 $ tmpfilename = tempnam ( $ this -> _tmp_dir , "Spreadsheet_Excel_Writer" ) ; $ fh = @ fopen ( $ tmpfilename , "w+b" ) ; } if ( $ fh === false ) { // If tmpfile() fails store data in memory
 $ this -> _using_tmpfile = false ; } else { // Store filehandle
 $ this -> _filehandle = $ fh ; } }
Open a tmp file to store the majority of the Worksheet data. If this fails,
for example due to write permissions, store the data in memory. This can be
slow for large files.

@access private
Open a tmp file to store the majority of the Worksheet data . If this fails for example due to write permissions store the data in memory . This can be slow for large files .