(PHP 4 >= 4.3.0, PHP 5, PHP 7)
mb_strtoupper — Make a string uppercase
$str
[, string $encoding = mb_internal_encoding()
] ) : string
Returns str
with all alphabetic characters converted to uppercase.
strThe string being uppercased.
encodingThe encoding
parameter is the character encoding. If it is omitted, the internal character
encoding value will be used.
str with all alphabetic characters converted to uppercase.
For more information about the Unicode properties, please see » http://www.unicode.org/unicode/reports/tr21/.
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).
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
?>