php mb_substr()函数截取中文字符串应用示例
substr()函数用来截取字符串，但是对于中文字符会出现问题，而mb_substr()和mb_strcut这两个函数可以，下面为大家介绍其具体用法
substr()函数用来截取字符串，但是对于中文字符会出现问题，而mb_substr()和mb_strcut这两个函数可以，用法与substr()相似，只是在函数最后要加入多一个参数，以设定字符串的编码，使用这两个函数需要在php.ini中把php_mbstring.dll打开。
'; echo mb_substr($string,0,4,'utf-8').'...'; echo mb_strcut($string,0,4,'utf-8').'...'; ?>
输出的结果：
21
你好我好...
你...
从上面的例子可以看出，mb_substr是按字来分割字符，而mb_strcut是按字节来分割字符，但是都不会产生半个字符的现象。
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