<?php $url = 'htttp://www.foobar.de/slideshow?parms=11,22,33&something=else'; $newSlideNo = 44; $searchPattern = '/(.*\d*,\d*,)(\d*)(.*)/'; $replacePattern = sprintf('${1}' . $newSlideNo . '${3}'); var_dump(preg_replace($searchPattern, $replacePattern, $url));
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