Case conversion-How does PHP make English strings lowercase

There is a lot of data in the system is mixed-case random string, and now I want to bulk conversion to lowercase form, what is the best way?

Reply content:

There is a lot of data in the system is mixed-case random string, and now I want to bulk conversion to lowercase form, what is the best way?

strtolower()In some environments, the introduction of strings with Chinese will be problematic, the following alternatives are recommended:

/** * 转换大写为小写字母（某些系统下自带的strtolower在转换含中文的串时出错） * @param string $string */public static function str_tolower($string){    return strtr($string, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz');}

Strtolower () function

Document

