mb_strtolower
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.
mb_strtoupper
(PHP 4 >= 4.3.0, PHP 5)
mb_strtoupper — 使字符串大写
说明
string mb_strtoupper
( string
$str
[, string $encoding = mb_internal_encoding()
] )
将所有的字母字符转化成大写并返回 str。
返回值
str 里所有的字母都转换成大写的。
Unicode
更多 Unicode 属性的信息，请参见 » http://www.unicode.org/unicode/reports/tr21/。
和 strtoupper() 不同的是，“字母”是通过 Unicode 字符属性来确定的。 因此这个函数不会受语言环境（locale）设置影响，能够转化任何具有“字母”属性的字符，例如 a 变音符号（ä）。
范例
Example #1 mb_strtoupper() 例子
<?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 非拉丁 UTF-8 文本的 mb_strtoupper() 例子
<?php
$str = "Τάχιστη αλώπηξ βαφής ψημένη γη, δρασκελίζει υπέρ νωθρού κυνός";
$str = mb_strtoupper($str, 'UTF-8');
echo $str; // 打印了 ΤΆΧΙΣΤΗ ΑΛΏΠΗΞ ΒΑΦΉΣ ΨΗΜΈΝΗ ΓΗ, ΔΡΑΣΚΕΛΊΖΕΙ ΥΠΈΡ ΝΩΘΡΟΎ ΚΥΝΌΣ
?>
add a note
User Contributed Notes
mb_strtoupper - [4 notes]
tomasz at trejderowski dot pl ¶
2 years ago
rai at philscan dot com ¶
3 years ago
for some reason, there are instances that special characters do show when you use this function, but when you revisit or refresh the page the special characters doesn't appear anymore, ie GRSARMERING is being displayed instead of GRÆSARMERING. You have to provide the second parameter which charset you are using to override the value. in my case it's iso-8859-1, so the function would now look like
mb_strtoupper($foo, 'iso-8859-1')
oriol dot torras at mobifriends dot com ¶
4 years ago
UTF-8 does not support html entities
ó is ó in UTF-8
cyril dot legret at free dot no-spam dot fr ¶
8 years ago
Be careful with htmlentities ...
<?
echo mb_strtoupper("L'élphant", "utf-8");
?>
output : L'&EACUTE;LPHANT