PHP is all processed server side, so nobody surfing the page can see the source (including search engine spiders). Like nuweb said, it is most likely being user later in the script, if not, take it out.
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Most likely copied from a source without fully understanding. Happens way too often when people want to get something out on the web without taking the time to learn, understand and then determine what is best...not just what is quick. IMHO.
iI have use in some of our sites the dinamic meta tags and this was not have a bad influence on Google or other search engine. The important thing is to do it corectly.