April 2026
Intermediate
1009 pages
34h 15m
English
Content preview from PHP and MySQL
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32.7 Screen Scraping and Captchas
The crowning glory: To round off this brief insight into the mindset of attackers, we present a particularly perfidious attack. Imagine you want to offer a page with the current stock market prices, but don't want to pay any fees for the prices yourself. No problem: Simply call up a stock exchange website with PHP in the background, read out the prices (e.g., with regular expressions), and display them on your page—naturally, in your own layout. This sounds good, is also very effective—and is illegal.
Note
Incidentally, this process is called screen scraping.
Another example: Suppose you want to send as much spam as possible. Freemail providers are suitable for this within certain limits. You could create ...
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