<?php $str = "GOODDAY"; $find = "O"; $replaceWith = "U"; $lastPos = 0; while (($lastPos = strpos($str, $find, $lastPos)) !== false) { echo substr_replace($str, $replaceWith, $lastPos, 1) . "\n"; $lastPos = $lastPos + strlen($find); } echo str_replace($find, $replaceWith, $str);
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