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Prevent Formula Injection In Excel Exports In PHP Using PHPSpreadSheet A user-supplied value that starts with =, +, - or @ becomes a live formula when the file is opened. See how PhpSpreadsheet triggers formula injection by default,… August 7, 2026 · PhpSpreadsheet Export MySQL Data To Excel Files In PHP Using PHPSpreadSheet This article shows how to run a query against MySQL and turn the result into a formatted .xlsx file with PhpSpreadsheet. The column names become the header row,… July 20, 2026 · PhpSpreadsheet