Why am I getting mime-type of .csv file as “application/octet-stream”?

Question

I\'m working on a PHP application that must import an excel file into MySQL. So I need to convert the excel file to .csv format. But when I want to get its type using

Answer 1

$_FILE['something']['type'] is populated by the browser / user OS, so it is not reliable. You should make your own check at server side to determine if uploaded file was in desired format.