<?php $cart = "1+10,2+10,3+10,5+10,6+10"; $product = 3; $change = 5; $finalcart = preg_replace_callback("/(.*" .$product . "\+)(\d+)(.*)/", function($m) use($change){ return $m[1] . ($m[2]+$change) . $m[3]; }, $cart); Echo $finalcart;
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