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PHP CAPTCHA Tutorial: Now, we try modification this class. This is last result our practice: <img phpspeedo_captcha3_2>

Yo see, we can not see perfect. So we must modify that dimension. Open captcha.class.php. Give attention at line (118):

      imagettftext($image, 25, 0, 8, 22,
                   $stringcolor,
                   $this->Font,
                   $this->CaptchaString);

This (imagettftext) is php function. Write text to the image using TrueType fonts. It have formula: array imagettftext ( resource image, int size, int angle, int x, int y, int color, string fontfile, string text )

Let I try size become 20, the result is:

You can try another parameter as you like.

The last, how if we want just for 4 digit? Open captcha.php. Find this line:

  //Create a CAPTCHA
  $captcha = new captcha(4);

  //Create a CAPTCHA
  $captcha = new captcha();

Oke, I hope this tutorial usefull for you. Give your comment please.