Image Captcha Spam Prevention
This is an open-source free PHP CAPTCHA script for generating complex images and CAPTCHA codes to protect forms from spam and abuse. It can be easily added into existing forms on your website to provide protection from spam bots. It can run on most any webserver as long as you have PHP installed, and GD support within PHP. Securimage does everything from generate complicated CAPTCHA images to making sure the code the user entered was correct.
Features:
- Only 3 lines of code to show an image
- Validate entries within 6 lines of code
- Customizable code length
- Choose the character set
- TTF font support
- Use custom GD fonts when TTF is not available
- Easily add background images
- Multi colored, angled, and transparent text options
- Arched lines through text
- Generates audible CAPTCHA files in wav format
- Use a word list for creating CAPTCHA codes
Step 1 (place the captcha image in your form):
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<img id="captcha" src="securimage/securimage_show.php" alt="CAPTCHA Image" />
Step 2 (insert text field into your form):
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<input type="text" name="captcha_code" size="10" maxlength="6" />
Step 3 (optional: adds dynamic reload of captcha image):
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<a href="#" onclick="document.getElementById('captcha').src = '/securimage/securimage_show.php?' + Math.random(); return false">Reload Image</a>
Step 4 (put into your form processing page):
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<?
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// include captcha class and create object
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// http://thedevnet.com/php/classes/image-captcha-spam-prevention/
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@ob_start();
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@session_start();
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include_once('securimage/securimage.php');
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$securimage = new Securimage();
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?>
Final Step (verify captcha in form processing page):
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<?
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if ($securimage->check($_POST['captcha_code']) == false) {
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// put your code in here for failed captcha
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}
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?>
loading...
Originally posted 2009-10-19 11:10:30.
Popularity: 9%
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