CodeIgniter File Upload Error: \"The filetype you are attempting to upload is not allowed.\" How to identify and fix the issue?

CodeIgniter: "The filetype you are attempting to upload is not allowed." Error

A user has reported an "The filetype you are attempting to upload is not allowed." error when uploading files with CodeIgniter. The issue is that the file's MIME type is not recognized by CodeIgniter.

In the provided code, the problem may lie in the _file_mime_type() function in the Upload library's source code. The issue is that this function retrieves the MIME type from the client's browser, which can be unreliable.

To resolve the issue, the user can edit the _file_mime_type() function in the Upload.php library and add a line of code that outputs the file type:

<code class="php">$this->_file_mime_type($_FILES[$field]); var_dump($this->file_type); die();</code>

After uploading a file, the MIME type will be displayed, and the user can add it to their mimes.php file.

Another possible cause of the error is mimetype corruption in Firefox browsers. To address this, the user can try the following:

• Download and install the latest version of Firefox.
• Reset Firefox settings to default.
• Clear Firefox cache and cookies.
• Disable Firefox add-ons and extensions.

If the issue persists, it may indicate a more complex server or browser issue that requires further investigation.

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