What is the issue with uppercase umlauts when using strtoupper in PHP?

When using strtoupper in PHP to convert a string to uppercase, uppercase umlauts (such as Ü) may not be converted correctly. This is because strtoupper converts characters based on their ASCII values, and uppercase umlauts do not have a direct ASCII equivalent. To solve this issue, you can use the mb_strtoupper function in PHP, which handles multibyte characters like uppercase umlauts correctly. 

$string = "über";
$uppercaseString = mb_strtoupper($string);
echo $uppercaseString;

Keywords

PHP strtoupper uppercase umlauts encoding

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