mb_convert_case()

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

对字符串进行大小写转换

说明

对一个string进行大小写转换，转换模式由$mode指定。

参数

要被转换的string。

转换的模式。它可以是MB_CASE_UPPER、MB_CASE_LOWER和MB_CASE_TITLE的其中一个。

$encoding参数为字符编码。如果省略，则使用内部字符编码。

返回值

按$mode指定的模式转换$string大小写后的版本。

Unicode

和类似strtolower()、strtoupper()的标准大小写转换函数相比，大小写转换的执行根据 Unicode 字符属性的基础。因此此函数的行为不受语言环境（locale）设置的影响，能够转换任意具有“字母”属性的字符，例如元音变音A（Ä）。

更多关于 Unicode 属性的信息，请查看» http://www.unicode.org/unicode/reports/tr21/。

范例

mb_convert_case()例子

非拉丁 UTF-8 文本的mb_convert_case()例子

参见

• mb_strtolower()使字符串小写
• mb_strtoupper()使字符串大写
• strtolower()将字符串转化为小写
• strtoupper()将字符串转化为大写
• ucfirst()将字符串的首字母转换为大写
• ucwords()将字符串中每个单词的首字母转换为大写

as the previouly posted version of this function doesn't handle UTF-8 characters, I simply tried to replace ucfirst to mb_convert_case, but then any previous case foldings were lost while looping through delimiters. 
So I decided to do an mb_convert_case on the input string (it also deals with words is uppercase wich may also be problematic when doing case-sensitive search), and do the rest of checking after that.
As with mb_convert_case, words are capitalized, I also added lowercase convertion for the exceptions, but, for the above mentioned reason, I left ucfirst unchanged.
Now it works fine for utf-8 strings as well, except for string delimiters followed by an UTF-8 character ("Mcádám" is unchanged, while "mcdunno's" is converted to "McDunno's" and "ökrös-TÓTH éDUa" in also put in the correct form)
I use it for checking user input on names and addresses, so exceptions list contains some hungarian words too.

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