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'/./' or '/foo/../' with '/' */ $re = array('#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#'); for($n=1; $n>0; $abs=preg_replace($re, '/', $abs, -1, $n)) {} /* absolute URL */ $abs = preg_replace($re, '/', $abs, -1, $n)) {} /* absolute URL is ready!

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