CI_Upload::is_image PHP Метод

    public function is_image()
    {
        // IE will sometimes return odd mime-types during upload, so here we just standardize all
        // jpegs or pngs to the same file type.
        $png_mimes = array('image/x-png');
        $jpeg_mimes = array('image/jpg', 'image/jpe', 'image/jpeg', 'image/pjpeg');
        if (in_array($this->file_type, $png_mimes)) {
            $this->file_type = 'image/png';
        } elseif (in_array($this->file_type, $jpeg_mimes)) {
            $this->file_type = 'image/jpeg';
        }
        $img_mimes = array('image/gif', 'image/jpeg', 'image/png');
        return in_array($this->file_type, $img_mimes, TRUE);
    }