PHP hack: SEO spam injection

The following chuck of PHPPHP PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML. http://php.net/manual/en/intro-whatis.php. code was found in a theme’s header.php file. Can you see how this would cause trouble? How would you fix it?

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