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@ 2014-05-21T10:05:47Z

<?php
$str = "pomo";
$pos = 2;
$str_to_replace = "aa";

$new_str = substr($str, 0, ($pos-1)).$str_to_replace.substr($str, $pos);

echo $new_str;

Output
Performance
VLD
References
Branches

substr: documentation ( source)

preferences:dark modelive preview

37.82 ms | 402 KiB | 5 Q