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authorJoël Cox <joel@joelcox.nl>2011-10-09 18:39:39 +0200
committerJoël Cox <joel@joelcox.nl>2011-10-09 18:39:39 +0200
commitf4fb1db458fab52d0493ead52c9ea7e01206eaa7 (patch)
treec549600f342f4d3f0df75a2f2f7c265be0f1cc72 /user_guide/helpers/captcha_helper.html
parentc4dd200c1155a118afa32cd91d9bd67bc243f83a (diff)
Moved tutorial to new user guide directory.
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-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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-<head>
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-<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-<title>CAPTCHA Helper : CodeIgniter User Guide</title>
-
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-<td><h1>CodeIgniter User Guide Version 2.0.3</h1></td>
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-<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
-<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
-CAPTCHA Helper
-</td>
-<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide&nbsp; <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" />&nbsp;<input type="submit" class="submit" name="sa" value="Go" /></form></td>
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-<!-- START CONTENT -->
-<div id="content">
-
-
-<h1>CAPTCHA Helper</h1>
-
-<p>The CAPTCHA Helper file contains functions that assist in creating CAPTCHA images.</p>
-
-
-<h2>Loading this Helper</h2>
-
-<p>This helper is loaded using the following code:</p>
-<code>$this->load->helper('captcha');</code>
-
-<p>The following functions are available:</p>
-
-<h2>create_captcha(<var>$data</var>)</h2>
-
-<p>Takes an array of information to generate the CAPTCHA as input and creates the image to your specifications, returning an array of associative data about the image.</p>
-
-<code>[array]<br />
-(<br />
-&nbsp;&nbsp;'image' => IMAGE TAG<br />
-&nbsp;&nbsp;'time' => TIMESTAMP (in microtime)<br />
-&nbsp;&nbsp;'word' => CAPTCHA WORD<br />
-)</code>
-
- <p>The "image" is the actual image tag:
-<code>&lt;img src=&quot;http://example.com/captcha/12345.jpg&quot; width=&quot;140&quot; height=&quot;50&quot; /&gt;</code></p>
-
- <p>The "time" is the micro timestamp used as the image name without the file
- extension. It will be a number like this: 1139612155.3422</p>
-
- <p>The "word" is the word that appears in the captcha image, which if not
- supplied to the function, will be a random string.</p>
-
- <h3>Using the CAPTCHA helper</h3>
-
- <p>Once loaded you can generate a captcha like this:</p>
-
-<code>$vals = array(<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'word' => 'Random word',<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'img_path' => './captcha/',<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'img_url' => 'http://example.com/captcha/',<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'font_path' => './path/to/fonts/texb.ttf',<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'img_width' => '150',<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'img_height' => 30,<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'expiration' => 7200<br />
-&nbsp;&nbsp;&nbsp;&nbsp;);<br />
-<br />
-$cap = create_captcha($vals);<br />
-echo $cap['image'];</code>
-
- <ul>
- <li>The captcha function requires the GD image library.</li>
- <li>Only the img_path and img_url are required.</li>
- <li>If a "word" is not supplied, the function will generate a random
- ASCII string. You might put together your own word library that
- you can draw randomly from.</li>
- <li>If you do not specify a path to a TRUE TYPE font, the native ugly GD
- font will be used.</li>
- <li>The "captcha" folder must be writable (666, or 777)</li>
- <li>The "expiration" (in seconds) signifies how long an image will
- remain in the captcha folder before it will be deleted. The default
- is two hours.</li>
- </ul>
-
- <h3>Adding a Database</h3>
-
- <p>In order for the captcha function to prevent someone from submitting, you will need
- to add the information returned from <kbd>create_captcha()</kbd> function to your database.
- Then, when the data from the form is submitted by the user you will need to verify
- that the data exists in the database and has not expired.</p>
-
- <p>Here is a table prototype:</p>
-
-<code>CREATE TABLE captcha (<br />
-&nbsp;captcha_id bigint(13) unsigned NOT NULL auto_increment,<br />
-&nbsp;captcha_time int(10) unsigned NOT NULL,<br />
-&nbsp;ip_address varchar(16) default '0' NOT NULL,<br />
-&nbsp;word varchar(20) NOT NULL,<br />
-&nbsp;PRIMARY KEY `captcha_id` (`captcha_id`),<br />
-&nbsp;KEY `word` (`word`)<br />
-);</code>
-
- <p>Here is an example of usage with a database. On the page where the CAPTCHA will be shown you'll have something like this:</p>
-
-<code>$this-&gt;load-&gt;helper(&#x27;captcha&#x27;);<br />
-$vals = array(<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&#x27;img_path&#x27; =&gt; &#x27;./captcha/&#x27;,<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&#x27;img_url&#x27; =&gt; &#x27;http://example.com/captcha/&#x27;<br />
-&nbsp;&nbsp;&nbsp;&nbsp;);<br />
-<br />
-$cap = create_captcha($vals);<br />
-<br />
-$data = array(<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&#x27;captcha_time&#x27; =&gt; $cap[&#x27;time&#x27;],<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&#x27;ip_address&#x27; =&gt; $this-&gt;input-&gt;ip_address(),<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&#x27;word&#x27; =&gt; $cap[&#x27;word&#x27;]<br />
-&nbsp;&nbsp;&nbsp;&nbsp;);<br />
-<br />
-$query = $this-&gt;db-&gt;insert_string(&#x27;captcha&#x27;, $data);<br />
-$this-&gt;db-&gt;query($query);<br />
-<br />
-echo &#x27;Submit the word you see below:&#x27;;<br />
-echo $cap[&#x27;image&#x27;];<br />
-echo &#x27;&lt;input type=&quot;text&quot; name=&quot;captcha&quot; value=&quot;&quot; /&gt;&#x27;;</code>
-
- <p>Then, on the page that accepts the submission you'll have something like this:</p>
-
-<code>// First, delete old captchas<br />
-$expiration = time()-7200; // Two hour limit<br />
-$this-&gt;db-&gt;query(&quot;DELETE FROM captcha WHERE captcha_time &lt; &quot;.$expiration); <br />
-<br />
-// Then see if a captcha exists:<br />
-$sql = &quot;SELECT COUNT(*) AS count FROM captcha WHERE word = ? AND ip_address = ? AND captcha_time &gt; ?&quot;;<br />
-$binds = array($_POST[&#x27;captcha&#x27;], $this-&gt;input-&gt;ip_address(), $expiration);<br />
-$query = $this-&gt;db-&gt;query($sql, $binds);<br />
-$row = $query-&gt;row();<br />
-<br />
-if ($row-&gt;count == 0)<br />
-{<br />
-&nbsp;&nbsp;&nbsp;&nbsp;echo &quot;You must submit the word that appears in the image&quot;;<br />
-}</code>
-
-</div>
-<!-- END CONTENT -->
-
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