PHP mb_strtoupper() Function

The mb_strtoupper() function is an inbuilt function in PHP that helps to transform the multibyte string to uppercase.

Syntax:

mb_strtoupper(string $string, ?string $encoding = null): string

Parameters:  This function has two parameters:

• string:  This parameter specifies the string that is to be made to uppercase.
• encoding: This parameter denotes the encoding parameter as the character encoding. In case if omitted or null,  then the internal character encoding value will be utilized.

Return value: This function converted all alphanumeric characters and then returns an uppercase string.

Example 1: The following code demonstrates the mb_strtoupper() function.

PHP

<?php

$str = "geeksforgeeks";
$str2 = mb_strtoupper($str);

echo $str2;

?>

Output:

GEEKSFORGEEKS

Example 2: The following code demonstrates the mb_strtoupper() function.

PHP

<?php

$str = "Τάχιστη αλώπηξ βαφής ψημένη γη, δρασκελίζει υπέρ νωθρού κυνός";
$str = mb_strtoupper($str, "UTF-8");

echo $str;

?>

Output:

ΤΆΧΙΣΤΗ ΑΛΏΠΗΞ ΒΑΦΉΣ ΨΗΜΈΝΗ ΓΗ, ΔΡΑΣΚΕΛΊΖΕΙ ΥΠΈΡ ΝΩΘΡΟΎ ΚΥΝΌΣ

Reference: https://www.php.net/manual/en/function.mb-strtoupper.php