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@ 2018-08-27T18:17:44Z

<?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;

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)

preferences:dark modelive previewkey bindings

1377.63 ms | 404 KiB | 5 Q