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    // Generate a visual verification code to make sure the user is no bot.
    $context['visual_verification'] = empty($modSettings['disable_visual_verification']);
    if ($context['visual_verification'])
    {
        $context['use_graphic_library'] = in_array('gd', get_loaded_extensions());
        $context['verificiation_image_href'] = $scripturl . '?action=verificationcode;rand=' . md5(rand());

        // Only generate a new code if one hasn't been set yet
        if (!isset($_SESSION['visual_verification_code']))
        {
            // Skip I, J, L, O and Q.
            $character_range = array_merge(range('A', 'H'), array('K', 'M', 'N', 'P'), range('R', 'Z'));

            // Generate a new code.
            $_SESSION['visual_verification_code'] = '';
            for ($i = 0; $i < 5; $i++)
                $_SESSION['visual_verification_code'] .= $character_range[array_rand($character_range)];
        }
    }
}

// Create the image for the visual verification code.
function showCodeImage($code)
{
    global $settings;

    // Is this GD2? Needed for pixel size.
    $testGD = get_extension_funcs('gd');
    $gd2 = in_array('imagecreatetruecolor', $testGD) && function_exists('imagecreatetruecolor');
    unset($testGD);

    // The amount of pixels inbetween characters.
    $character_spacing = 1;

    // The color of the characters shown (red, green, blue).
    $foreground_color = array(64, 101, 136);
    $background_color = array(236, 237, 243);

    // Has the theme author requested a custom color?
    if (isset($settings['verification_foreground'], $settings['verification_background']))
    {
        $foreground_color = $settings['verification_foreground'];
        $background_color = $settings['verification_background'];
    }

    if (!is_dir($settings['default_theme_dir'] . '/fonts'))
        return false;

    // Get a list of the available fonts.
    $font_dir = dir($settings['default_theme_dir'] . '/fonts');
    $font_list = array();
    $ttfont_list = array();
    while ($entry = $font_dir->read())
    {
        if (preg_match('~^(.+)\.gdf$~', $entry, $matches) === 1)
            $font_list[] = $entry;
        elseif (preg_match('~^(.+)\.ttf$~', $entry, $matches) === 1)
            $ttfont_list[] = $entry;
    }

    if (empty($font_list))
        return false;

    // Create a list of characters to be shown.
    $characters = array();
    $loaded_fonts = array();
    for ($i = 0; $i < strlen($code); $i++)
    {
        $characters[$i] = array(
            'id' => $code{$i},
            'font' => array_rand($font_list),
        );

        $loaded_fonts[$characters[$i]['font']] = null;
    }

    // Load all fonts and determine the maximum font height.
    foreach ($loaded_fonts as $font_index => $dummy)
        $loaded_fonts[$font_index] = imageloadfont($settings['default_theme_dir'] . '/fonts/' . $font_list[$font_index]);

    // Determine the dimensions of each character.
    $total_width = $character_spacing * strlen($code) + 10;
    $max_height = 0;
    foreach ($characters as $char_index => $character)
    {
        $characters[$char_index]['width'] = imagefontwidth($loaded_fonts[$character['font']]);
        $characters[$char_index]['height'] = imagefontheight($loaded_fonts[$character['font']]);

        $max_height = max($characters[$char_index]['height'], $max_height);
        $total_width += $characters[$char_index]['width'];
    }

    // Create an image.
    $code_image = imagecreate($total_width, $max_height);

    // Draw the background.
    $bg_color = imagecolorallocate($code_image, $background_color[0], $background_color[1], $background_color[2]);
    imagefilledrectangle($code_image, 0, 0, $total_width - 1, $max_height - 1, $bg_color);

    // Randomize the foreground color a little.
    for ($i = 0; $i < 3; $i++)
        $foreground_color[$i] = rand(max($foreground_color[$i] - 3, 0), min($foreground_color[$i] + 3, 255));
    $fg_color = imagecolorallocate($code_image, $foreground_color[0], $foreground_color[1], $foreground_color[2]);

    // Color for the dots.
    for ($i = 0; $i < 3; $i++)
        $dotbgcolor[$i] = $background_color[$i] < $foreground_color[$i] ? rand(0, max($foreground_color[$i] - 20, 0)) : rand(min($foreground_color[$i] + 20, 255), 255);
    $randomness_color = imagecolorallocate($code_image, $dotbgcolor[0], $dotbgcolor[1], $dotbgcolor[2]);

    // Fill in the characters.
    $cur_x = 0;
    foreach ($characters as $char_index => $character)
    {
        // Can we use true type fonts?
        $can_do_ttf = function_exists('imagettftext');
        if (!empty($can_do_ttf))
        {
            // GD2 handles font size differently.
            $font_size = $gd2 ? rand(15, 18) : rand(18, 25);

            // Work out the sizes - also fix the character width cause TTF not quite so wide!
            $font_x = $cur_x + 5;
            $font_y = $max_height - rand(2, 8);

            // What font face?
            if (!empty($ttfont_list))
            {
                $fontface = $settings['default_theme_dir'] . '/fonts/' . $ttfont_list[rand(0, count($ttfont_list) - 1)];
                //log_error($fontface);
            }

            // What color are we to do it in?
            $is_reverse = rand(0, 1);
            $char_color = imagecolorallocate($code_image, rand(max($foreground_color[0] - 2, 0), $foreground_color[0]), rand(max($foreground_color[1] - 2, 0), $foreground_color[1]), rand(max($foreground_color[2] - 2, 0), $foreground_color[2]));

            $angle = rand(-100, 100) / 10;
            $show_letter = rand(0, 1) ? $character['id'] : strtolower($character['id']);
            $fontcord = @imagettftext($code_image, 18, $angle, $font_x, $font_y, $char_color, $fontface, $show_letter);
            if (empty($fontcord))
                $can_do_ttf = false;
            elseif ($is_reverse)
            {
                imagefilledpolygon($code_image, $fontcord, 4, $fg_color);
                // Put the character back!
                imagettftext($code_image, 18, $angle, $font_x, $font_y, $randomness_color, $fontface, $show_letter);
            }

            if ($can_do_ttf)
                $cur_x = max($fontcord[2], $fontcord[4]) + 3;
        }

        if (!$can_do_ttf)
        {
            // Rotating the characters a little...
            if (function_exists('imagerotate'))
            {
                $char_image = function_exists('imagecreatetruecolor') ? imagecreatetruecolor($character['width'], $character['height']) : imagecreate($character['width'], $character['height']);
                $char_bgcolor = imagecolorallocate($char_image, $background_color[0], $background_color[1], $background_color[2]);
                imagefilledrectangle($char_image, 0, 0, $character['width'] - 1, $character['height'] - 1, $char_bgcolor);
                imagechar($char_image, $loaded_fonts[$character['font']], 0, 0, $character['id'], imagecolorallocate($char_image, rand(max($foreground_color[0] - 2, 0), $foreground_color[0]), rand(max($foreground_color[1] - 2, 0), $foreground_color[1]), rand(max($foreground_color[2] - 2, 0), $foreground_color[2])));
                $rotated_char = imagerotate($char_image, rand(-100, 100) / 10, $char_bgcolor);
                imagecopy($code_image, $rotated_char, $cur_x, 0, 0, 0, $character['width'], $character['height']);
                imagedestroy($rotated_char);
                imagedestroy($char_image);
            }
    
            // Sorry, no rotation available.
            else
                imagechar($code_image, $loaded_fonts[$character['font']], $cur_x, floor(($max_height - $character['height']) / 2), $character['id'], imagecolorallocate($code_image, rand(max($foreground_color[0] - 2, 0), $foreground_color[0]), rand(max($foreground_color[1] - 2, 0), $foreground_color[1]), rand(max($foreground_color[2] - 2, 0), $foreground_color[2])));
            $cur_x += $character['width'] + $character_spacing;
        }
    }

    // Make the background color transparent.
    imagecolortransparent($code_image, $bg_color);

    // Add some randomness to the background.
    for ($i = rand(0, 2); $i < $max_height; $i += rand(1, 2))
        for ($j = rand(0, 10); $j < $total_width; $j += rand(1, 15))
            imagesetpixel($code_image, $j, $i, rand(0, 1) ? $fg_color : $randomness_color);

    // Put in some lines too.
    $num_lines = 2;
    for ($i = 0; $i < $num_lines; $i++)
    {
        if (rand(0, 1))
        {
            $x1 = rand(0, $total_width);
            $x2 = rand(0, $total_width);
            $y1 = 0; $y2 = $max_height;
        }
        else
        {
            $y1 = rand(0, $max_height);
            $y2 = rand(0, $max_height);
            $x1 = 0; $x2 = $total_width;
        }

        imageline($code_image, $x1, $y1, $x2, $y2, rand (0, 1) ? $fg_color : $randomness_color);
    }

    // Show the image.
    if (function_exists('imagegif'))
    {
        header('Content-type: image/gif');
        imagegif($code_image);
    }
    else
    {
        header('Content-type: image/png');
        imagepng($code_image);
    }

    // Bail out.
    imagedestroy($code_image);
    die();
}

// Create a letter for the visual verification code.
function showLetterImage($letter)
{
    global $settings;

    if (!is_dir($settings['default_theme_dir'] . '/fonts'))
        return false;

    // Get a list of the available font directories.
    $font_dir = dir($settings['default_theme_dir'] . '/fonts');
    $font_list = array();
    while ($entry = $font_dir->read())
        if ($entry{0} !== '.' && is_dir($settings['default_theme_dir'] . '/fonts/' . $entry) && file_exists($settings['default_theme_dir'] . '/fonts/' . $entry . '.gdf'))
            $font_list[] = $entry;

    if (empty($font_list))
        return false;

    // Pick a random font.
    $random_font = $font_list[array_rand($font_list)];

    // Check if the given letter exists.
    if (!file_exists($settings['default_theme_dir'] . '/fonts/' . $random_font . '/' . $letter . '.gif'))
        return false;

    // Include it!
    header('Content-type: image/gif');
    include($settings['default_theme_dir'] . '/fonts/' . $random_font . '/' . $letter . '.gif');