excel - Sanitizing data in PHP for excell xml -

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i using "excel xml" php library (marin crnković, version 0.9) write data database .xls file. problem database contains data not legal, , causes microsoft excel give me errors when opening file. (the document cannot opened because there problems contents)

samples of bad data causing excel display errors instead of opening file:

!(()&&!|||

'"()&%1prompt(918861)

'&cat /etc/passwd&'

'&dir&'

"&cat /etc/passwd&"

email&n921923=v950402

is there recommended function sanitize data before inserting data excel file?

it might need escape/encode ampersands before using them excel spreadsheets (as new formats xml-based). php, perhaps try like:

$value = str_replace('&', '&', $value);

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