/**
* Generates a string that can be used as captcha competition.
*
* @param int $length Length of the string.
*
* @return string Captcha string.
*
* @author Christian Achatz
* @version
* Version 0.1, 28.12.2007<br />
*/
public static function generateCaptchaString($length)
{
// shuffles random numbers
srand(StringAssistant::generateSeed());
$characterBase = 'ABCDEFGHJKLMNPRSTUVWXYZabcdefghijkmnpqrstuvwxyz23456789';
$captchaString = (string) '';
while (strlen($captchaString) < $length) {
$captchaString .= substr($characterBase, rand() % strlen($characterBase), 1);
}
return $captchaString;
}
