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---
date: "2006-03-04T04:00:46Z"
title: Using Akismet in PHP4 to Defeat Comment Spam
---
<p>I've been having comment spam problems on <a href="http://paulduncan.org/" title="All my non-tech-related posts.">my personal page</a>.
<a href="http://wordpress.org/" title="Wordpress, the popular PHP-based blogging tool.">Wordpress</a> uses <a href="http://akismet.com/" title="Anti-spam system used by Wordpress.">Akismet</a> for comment spam filtering now-a-days,
and there are <a href="http://akismet.com/development/" title="Akismet bindings for several popular programming languages.">bindings</a> for several languages, including <a href="http://php.net/" title="Version 4 of the PHP programming language."><acronym title="PHP: Hypertext Preprocessor">PHP</acronym>5</a>,
<a href="http://kemayo.wordpress.com/2005/12/02/akismet-py/" title="Akismet bindings for Python.">Python</a>, and <a href="http://www.blojsom.com/blog/nerdery/2005/12/02/Akismet-API-in-Ruby.html" title="Akismet bindings for Ruby.">Ruby</a>. The <a href="http://akismet.com/development/api/" title="Akismet API documentation.">Akismet <acronym title="Application Programming Interface">API</acronym> documentation</a>
documentation has a <a href="http://php.net/" title="Version 4 of the PHP programming language."><acronym title="PHP: Hypertext Preprocessor">PHP</acronym>4</a>-friendly code snippet, but a quick
<a href="http://google.com/" title="The infamouse Google search engine.">Google</a> search didn't turn up any full-blown <a href="http://php.net/" title="Version 4 of the PHP programming language."><acronym title="PHP: Hypertext Preprocessor">PHP</acronym>4</a> bindings,
so I wrote my own. Here's an example of the <acronym title="Application Programming Interface">API</acronym>:</p>
<pre><code>#
# Check comment using Akismet (http://akismet.com/). Returns true for
# spam, and false for ham.
#
function is_comment_spam($news_id, $name, $email, $url, $comment) {
global $AKISMET_CONFIG;
# populate comment information
$comment_data = array(
'user_ip' => $_SERVER['REMOTE_ADDR'],
'user_agent' => $_SERVER['HTTP_USER_AGENT'],
'referrer' => $_REQUEST['REFERER'],
'permalink' => "http://paulduncan.org/?id=$news_id",
'comment_type' => 'comment',
'comment_author' => $name,
'comment_author_email' => $email,
'comment_author_url' => $url,
'comment_content' => $comment,
);
# create akismet handle
$ak = new Akismet($AKISMET_CONFIG['api_key'],
$AKISMET_CONFIG['blog']);
# return akismet result (true for spam, false for ham)
return $ak->check_comment($comment_data);
}
</code></pre>
<p><a href="http://pablotron.org/files/akismet-php4-0.1.0.tar.gz" title="Download a tarball of my PHP4 Akismet bindings.">Download php4-akismet-0.1.tar.gz</a> (<a href="http://pablotron.org/files/akismet-php4-0.1.0.tar.gz.asc" title="OpenPGP signature for version 0.1.0 of my PHP4 Akismet bindings.">Signature</a>)</p>
<p><b>Update:</b> Fixed a minor typo in the example.</p>
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