mb_strtoupper

(PHP 4 >= 4.3.0, PHP 5)

mb_strtoupper — Make a string uppercase

说明

string mb_strtoupper ( string $str [, string $encoding = mb_internal_encoding() ] )

Returns str with all alphabetic characters converted to uppercase.

参数

str: The string being uppercased.
encoding: encoding 参数为字符编码。如果省略，则使用内部字符编码。

返回值

str with all alphabetic characters converted to uppercase.

Unicode

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).

范例

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
?>

参见

mb_strtolower() - Make a string lowercase
mb_convert_case() - Perform case folding on a string
strtoupper() - 将字符串转化为大写

mb_strwidth

mb_strtolower

[edit] Last updated: Fri, 25 May 2012

add a note User Contributed Notes mb_strtoupper

tomasz at trejderowski dot pl 28-Dec-2010 10:01


Please note, that in many cases, forcing UTF-8 encoding with second parameter is necessary. PHP documentation states that if this parameter is omitted, the internal character encoding value will be used. But in my case it turned out to be not true. Even though I have all my pages encoded in UTF-8 and my DB connection set to force UTF-8 encoding, comparison of user-input and DB-retrieved data, which is using mb_strtoupper, did not work until I forced encoding.

rai at philscan dot com 09-Aug-2009 06:33


for some reason, there are instances that special characters do show when you use this function, but when you revisit or refresh the page the special characters doesn't appear anymore, ie GRSARMERING is being displayed instead of GRÆSARMERING. You have to provide the second parameter which charset you are using to override the value. in my case it's iso-8859-1, so the function would now look like



mb_strtoupper($foo, 'iso-8859-1')

oriol dot torras at mobifriends dot com 23-Nov-2008 11:13


UTF-8 does not support html entities

&oacute; is ó in UTF-8

cyril dot legret at free dot no-spam dot fr 25-Feb-2005 06:40


Be careful with htmlentities ...

<?

echo mb_strtoupper("L'&eacute;l�phant", "utf-8");

?>

output : L'&EACUTE;L�PHANT

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