File Upload Class - MIME type detection error - 2.1.0

[eluser]StickGrinder[/eluser]
Just in case someone else has this error and above solutions don't work:

I'm running CI 2.1 (vanilla) on PHP 5.3.10 - (mod_php, Ubuntu server) and the error persists.
Figured out that in system/libraries/Upload.php, from line 597 the following code

Code:

$ext = strtolower(ltrim($this->file_ext, '.'));

        if ( ! in_array($ext, $this->allowed_types))
        {
            return FALSE;
        }

invariabily fails, since for what I think is a bug in PHP, $ext value before the if statement is correct, while after the if statement (and during it, it seems), it changes.

To check this out try this:

Code:

$ext = strtolower(ltrim($this->file_ext, '.'));

        echo var_dump($ext);

        if ( ! in_array($ext, $this->allowed_types))
        {
            die(var_dump($ext));
            return FALSE;
        }

Changing the variable name to $fext across all class did the trick for me: the value remains untouched.

EDIT: I lied! It fails equally. The ONLY viable solution I found is to use a constant instead. AWFUL solution follows!

Code:

define('ULFEXT', strtolower(ltrim($this->file_ext, '.')));

        if ( ! in_array(ULFEXT, $this->allowed_types))
        {
            return FALSE;
        }

        $ext = ULFEXT;

Thanks PHP. And if someone is thinking about testing out some other framework, my advice is to frog-leap to another language too. meh.