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Both Ryan and Marie provided good answers, but let me elaborate further. This is not a php thing. You can verify this yourself by visiting these pages. Does the page content change when you visit /?lang=en&limit=5&limitstart=20 and switch to /?lang=en&limit=5&limitstart=20? If these look like the same page, then you have a duplicate content/title issue on your hands. Google's take on the matter is simple... "Provide one version of a URL to reach a document To prevent users from linking to one version of a URL and others linking to a different version (this could split the reputation of that content between the URLs), focus on using and referring to one URL in the structure and internal linking of your pages. If you do find that people are accessing the same content through multiple URLs, setting up a 301 redirect from non-preferred URLs to the dominant URL is a good solution for this. You may also use canonical URL or use the rel="canonical" link element if you cannot redirect" You have several options to deal with this, depending on the content_._ Use the canonical tag to point the different versions of the page towards a single, definitive URL. Best to use this option only if the pages are actually duplicate. If the pages are not duplicate in content, but duplicate in title, then make sure your CMS writes unique title tags for every unique page of content, as Marie describes. If these extra pages are producing lists of only slightly varying entries, like a list of blog archives, you may consider adding a Meta Robots tag to NOINDEX, FOLLOW those superfluous pages. If dealing with pagination, here's an excellent article from Adam Audette to help. This is a tricky area, and you must be careful when dealing with duplicate content, because it's easy to make a mistake and have Google de-index your content. That said, by correcting these errors, you just might see an improvement in your indexation and traffic stats.