Installation of PHP Spreadsheet_Excel_Writer module:
+ $> sudo apt-get install php-pear
$> sudo pear install OLE channel://pear.php.net/OLE-1.0.0RC2
$> sudo pear install Spreadsheet_Excel_Writer \
channel://pear.php.net/Spreadsheet_Excel_Writer-0.9.3
+
+ $> cd /usr/share/php
+ $> sudo patch -Np1 -i spreadsheet-excel-writer-fix-pass-by-reference.patch
+