Make a string uppercase

# mb_strtoupper

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

mb_strtoupper — Make a string uppercase

### Description

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

Returns `string` with all alphabetic characters converted to uppercase.

### Parameters

`string`

  The string being uppercased.

`encoding`

  The `encoding` parameter is the character encoding. If it is omitted or `null`, the internal character encoding value will be used.

### Return Values

`string` with all alphabetic characters converted to uppercase.

### Examples

Example #1 mb_strtoupper() example

`<?php
$str = "Mary Had A Little Lamb and She LOVED It So";
$str = mb_strtoupper($str);
echo $str; // Prints MARY HAD A LITTLE LAMB AND SHE LOVED IT SO
?>`

Example #2 mb_strtoupper() example with non-Latin UTF-8 text

`<?php
$str = "Τάχιστη αλώπηξ βαφής ψημένη γη, δρασκελίζει υπέρ νωθρού κυνός";
$str = mb_strtoupper($str, 'UTF-8');
echo $str; // Prints ΤΆΧΙΣΤΗ ΑΛΏΠΗΞ ΒΑΦΉΣ ΨΗΜΈΝΗ ΓΗ, ΔΡΑΣΚΕΛΊΖΕΙ ΥΠΈΡ ΝΩΘΡΟΎ ΚΥΝΌΣ
?>`

### Notes

By contrast to strtoupper(), 'alphabetic' is determined by the Unicode character properties. Thus the behaviour of this function is not affected by locale settings and it can convert any characters that have 'alphabetic' property, such as a-umlaut (ä).

For more information about the Unicode properties, please see » http://www.unicode.org/reports/tr21/.

### See Also

- mb_strtolower() - Make a string lowercase
- mb_convert_case() - Perform case folding on a string
- strtoupper() - Make a string uppercase

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