CI file type is not allowed in the upload column

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The type of this file is not an error such as the list of forbidden uploads. The main reason for this error is that PHP Hp_fileinfo is not turned on,

Especially under Windows, php5.3 below. Because CI will use this extension to check the file type,

And above php5.3 the extension is introduced by default, not an extension. So you need to open the extension and restart the service.

Another reason is that the MIME type set is special, not the config/mime.php of CI, and the MIME type needs to be added according to the actual situation.

Add MIME type:

Type Optional range of XLS
' xls ' = = Array (' Application/vnd.ms-excel ', ' application/msexcel ', ' application/x-msexcel ', ' application/ X-ms-excel ', ' application/x-excel ', ' application/x-dos_ms_excel ', ' Application/xls ', ' Application/x-xls ', ' Application/excel ', ' application/download ', ' application/vnd.ms-office ', ' Application/msword ', ' application/ Octet-stream '),

Type optional range for xlsx
' xlsx ' = = Array (' Application/vnd.openxmlformats-officedocument.spreadsheetml.sheet ', ' application/zip ', ' Application/vnd.ms-excel ', ' application/ms-excel ', ' application/x-ms-excel ',
' Application/x-msexcel ', ' Application/msword ', ' application/x-excel ', ' application/x-dos_ms_excel ', ' application/ XLS ', ' application/x-xls ', ' application/excel ', ' application/download ', ' Application/vnd.ms-office ',
\ ' Application/msword ', ' application/x-zip ', ' application/octet-stream ', ' application/ Vnd.openxmlformats-officedocument.spreadsheetml.sheet '),

CI file type is not allowed in the upload column