It requires PHP. Where are you trying it out, on your local machine? If so, unless you have a local server with PHP like wmap or xamp, it's not going to work. If you're putting it up live and your host has PHP enabled, that could work. Sometimes though, even with PHP, there can be errors depending upon the PHP installation's version and/or settings.
And of course the problem might lie elsewhere.
If you want more help:
Please post a link to a page on your site that contains the problematic code so we can check it out.
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