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mb_为什么 PHP中默认不使用PHP 多字节字符串函数(以 开头的函数)?
mb_
向后兼容性。旧的 PHP 脚本依赖于非多字节功能。
另见:http ://www.php.net/manual/en/mbstring.overload.php
因为非多字节函数首先出现。