I'm just trying to make fixed the $str to 5 characters, but couldn't.

$str = "nü";
echo str_pad($str, 5, "ü"); // give nüü

I know that's an unicode issue and searched a lot but no luck. I unsuccessfully tried somethings such as this:

echo str_pad($str, 4 + mb_strlen($s), $s);
echo str_pad($str, 5 + mb_strlen($s), $s);
php string unicode
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