Pear Spreadsheet_Excel_Writer created on PHP 4.
Trials to solve problem:
deprecated error report & solution:
error when deal with a large amount of data
The solution is change in Root.php line 623 :
fwrite($FILE, pack("V", 1));
fwrite($FILE, pack("V", $num_sb_blocks));
the file is pear/OLE/PPS/Root.php in package OLE 1.0.0RC2 (beta)