PHP SimpleCaptcha::setFontSizeRange示例

require_once $include_path . "/lib/captcha.class.php";
if (USE_CAPTCHA) {
    if (isset($_GET['id']) && !empty($_GET['id'])) {
        $_GET['id'] = trim($_GET['id']);
        $id = addslashes($_GET['id']);
        $expired = time() - 1200;
        $db = new gbook_sql();
        $db->connect();
        $db->query("DELETE FROM {$GB_TBL["cap"]} WHERE timestamp < {$expired}");
        $res = $db->query("SELECT * FROM {$GB_TBL["cap"]} WHERE session_id='{$id}' LIMIT 1");
        $result = $db->fetch_array($res);
        if (isset($result['validate_key'])) {
            $imageType = "";
            if (extension_loaded("gd")) {
                $img = new SimpleCaptcha();
                $img->setFontSizeRange(14, 18);
                reset($img->supportedImagesTypes);
                $imageType = key($img->supportedImagesTypes);
                $img->setText($result['validate_key']);
            } else {
                require_once $include_path . "/lib/bitmapimagetext.class.php";
                $img = new BitmapImageText();
                $img->setText(strtoupper($result['validate_key']));
            }
            $img->setBackgroundColors(array("EEEEEE", "F2F3D3", "F5EAEA", "E4F3EE", "EEE4F3", "FFE6E6"));
            $img->setTextColors(array("000000", "FD130A", "0A1BFD", "149703", "486C66", "870DC3", "D78406", "105243"));
            if (!empty($imageType)) {
                $img->getImage($imageType);
            } else {
                $img->getImage();
            }