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Replace Character Codes using PHP.

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How to replace character codes for german using str_replace php function. Characters such as :

ä
Ä'
é
ö
Ö
ü
Ü
Other chars.

see simple example.

 <?php
   $find ="ü";
   $rep = "u";
   $str = "aüstin";
   echo str_replace($find,$rep,utf8_encode($str));
?>
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