Question: how to convert excel file into csv using php?
Answer: In Convert XLS to CSV tutorial, I have explained how to convert XLS to CSV in PHP using PHPExcel Library. ... 
Step 1). ... 
Step 2). ... 
Step 3) Open Excel file using PHPExcel IOFactory $objReader = PHPExcel_IOFactory::createReader("Excel5"); //Excel5 is the type of excel file. $ ... 
Supported File readers :