PhpCaptcha::SetMaxFontSize PHP Method

    function SetMaxFontSize($iMaxFontSize)
    {
        $this->iMaxFontSize = $iMaxFontSize;
    }

<?php

require 'php-captcha.inc.php';
$fonts = array('fonts/VeraBd.ttf', 'fonts/VeraIt.ttf', 'fonts/Vera.ttf');
$captcha = new PhpCaptcha($fonts, 140, 50);
//$captcha->SetBackgroundImages('images/captcha.jpg');
$captcha->setNumChars(4);
$captcha->SetNumLines(80);
$captcha->UseColour(true);
//$captcha->DisplayShadow(true);
$captcha->SetMinFontSize(13);
$captcha->SetMaxFontSize(19);
$captcha->SetCharSet('A-Z,1-9');
$captcha->Create();