How can the strtoupper() function in PHP be used effectively to convert strings to uppercase, especially when dealing with special characters?

When dealing with special characters, the strtoupper() function in PHP may not always convert them to uppercase correctly. To address this issue, you can use the mb_strtoupper() function, which supports multi-byte characters and can handle special characters properly. By using mb_strtoupper(), you can ensure that all characters, including special ones, are converted to uppercase accurately. 

// Using mb_strtoupper() to convert a string to uppercase with special characters
$string = "héllø wørld!";
$uppercaseString = mb_strtoupper($string, 'UTF-8');
echo $uppercaseString;

Keywords

PHP strtoupper() strings uppercase special characters

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