WP_CodeShield
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This plugin makes it easier to post code in the comments and posts by automatically converting text inside code tags to correct html.
This plugin escapes all text inside code tags so you don’t have to worry about converting code to HTML characters (e.g. >‘s to >‘s). The contents of code tags inside posts and comments are run through php’s htmlspecialchars.
This plugin is available for download for your site.