Php 转换为大写西里尔文

我需要将西里尔字母字符串转换为大写。未找到函数mb_struppe

 Call to undefined function mb_strtoupper()

我该怎么做

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如何更改西里尔文中的大写字母？

mbstring

是默认情况下未启用的PHP扩展。他们说：

mbstring是非默认扩展名。这意味着它不是由 违约必须使用configure命令显式启用模块 选项有关详细信息，请参阅安装部分

以下配置选项与mbstring模块相关

--enable-mbstring : Enable mbstring functions. This option is required to use mbstring functions.

libmbfl is necessary for mbstring. libmbfl is bundled with mbstring. Before PHP 7.3.0, if libmbfl is already installed on the

系统，-with libmbfl[=DIR]可以指定为使用已安装的 图书馆

--disable-mbregex : Disable regular expression functions with multibyte character support.

Oniguruma is necessary for the regular expression functions with multibyte character support. Oniguruma is bundled with mbstring. As of

PHP 5.4.0，如果系统上已安装Oniguruma， --可以指定使用onig[=DIR]来使用已安装的库

--disable-mbregex : Disable regular expression functions with multibyte character support.

Oniguruma is necessary for the regular expression functions with multibyte character support. Oniguruma is bundled with mbstring. As of

As of PHP 5.4.0 it is possible to disable the multibyte regex backtrack check by specifying --disable-mbregex-backtrack .

可能的副本也请参见