Chap 1 - captcha.php and debugging statements
In captcha.php, it is best to avoid putting any debugging statements
that print to the browser, such as print "I have this value at this line".
If you do, then the image will not come out. Avoid having them
in any included files as well.
This type of problem happened in Chapter 9 and there is a more
detailed discussion of this type of problem in the
post "Chap 9, Debugging issues, and graphs not showing up.".
If anyone is stuck in captcha.php, I hope this is helpful.
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