Why Does My CodeIgniter Upload Fail with a \'Filetype Not Allowed\' Error Despite Correct Configuration?

Understanding the "Filetype Not Allowed" Error in CodeIgniter

In CodeIgniter, when attempting to upload a file with an unsupported type, you may encounter the error message, "The filetype you are attempting to upload is not allowed." This issue arises due to a mismatch between the file's extension and its actual MIME type.

Configuring the Upload Library

When setting up the upload library, you define the list of allowed file types using the allowed_types configuration parameter. However, the problem can occur when the server interprets the file's extension as its MIME type.

Firefox Mimetype Misinterpretation

In particular, Firefox is known to misinterpret file extensions and assign incorrect MIME types. For example, it may interpret a WMV file's .wmv extension as video/x-ms-wmv. This causes the upload to fail despite the correct configuration in config/mimes.php.

Resolving the Issue

To address this issue, you can modify the Upload library's _file_mime_type() method to output the actual MIME type. By adding a line after 199:

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

When you then upload a file with an incorrectly recognized MIME type, the script will die and output the correct MIME type. You can then add this type to your config/mimes.php configuration.

Additional Considerations

Remember that browser configurations or server settings can impact upload behavior. Therefore, it's worth checking the behavior on different browsers and server environments to identify potential variations.

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