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Hey monks,

I'm trying to figure out how to create a system where the user must type in a phrase or somesuch from an image that's displayed on the page as a form of verification to prevent spam, autosignups, etc. Yahoo! and Google's Blogger do this (A PHP tutorial here, and an example here (near the bottom of the page)).

I know merlyn has an article on this on his website, but I can't seem to find it.

I also know it's going to involve GD::*, or Image::Magick (or something along those lines), a random string/word generator, and some hidden form values. Beyond that, I'm not sure.

Any ideas?


In reply to Image verification on form submissions by stonecolddevin

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
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