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@ 2013-10-04T12:14:33Z

<?php

$str = 'abc<abc>abc> => cbc<bbc>cbc>';

$str = preg_replace_callback('/(<)[^>]++>|.++/', function ($m) {
return str_replace($m, 'a', isset($m[1]) ? 'b' : 'c', $m[0]);
}, $str);

echo $str;

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
str_replace: documentation ( source)

preferences:dark modelive preview

35.86 ms | 402 KiB | 5 Q