I have a question about the php methods for image verification in forms. All the tutorials i have seen to do this use a temp image file, normally verify.png, and i was just wondering if anyone has run into a problem with the image changing as the page loads. I know that seems unlikely but if the timing was right, it seems like the image could possibly change if two people loaded the page at almost the same time, which would mean the person couldn't possibly enter the right code. Has anyone run into this problem or found a way of doing it without usign a temp image file?
Image-Verifications in forms with PHP
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