http://cn.php.net/manual/en/class.com.php
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I have searched for ways to open and read an excel document and I found some information which I thought that I would document. Information on the object model to help with programming COM objects can be found in your MS Office help files, search for VBA*.chm.
Also, here is a script that I used to pull a cell from each worksheet, complete w/ variable for pathnames & worksheets. This script also closes excel completely. The coding might be dirty, but it gets the job done.
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<pre>
<?PHP
$filename = "c:/spreadhseet/test.xls";
$sheet1 = 1;
$sheet2 = "sheet2";
$excel_app = new COM("Excel.application") or Die ("Did not connect");
print "Application name: {$excel_app->Application->value}\n" ;
print "Loaded version: {$excel_app->Application->version}\n";
$Workbook = $excel_app->Workbooks->Open("$filename") or Die("Did not open $filename $Workbook");
$Worksheet = $Workbook->Worksheets($sheet1);
$Worksheet->activate;
$excel_cell = $Worksheet->Range("C4");
$excel_cell->activate;
$excel_result = $excel_cell->value;
print "$excel_result\n";
$Worksheet = $Workbook->Worksheets($sheet2);
$Worksheet->activate;
$excel_cell = $Worksheet->Range("C4");
$excel_cell->activate;
$excel_result = $excel_cell->value;
print "$excel_result\n";
#To close all instances of excel:
$Workbook->Close;
unset($Worksheet);
unset($Workbook);
$excel_app->Workbooks->Close();
$excel_app->Quit();
unset($excel_app);
?>
</pre>