Home Backend Development PHP Tutorial 在公司遇到两个php小疑点

在公司遇到两个php小疑点

Jun 13, 2016 am 10:54 AM
mb mbstring php strlen

在公司遇到两个php小问题

在公司遇到两个php小问题:
sleep(10);如果不放在for循环里面在流程下面将会继续执行,而不会等待.


mb_strlen(val,"utf-8");
还是有关中文的问题。PHP内置的字符串长度函数strlen无法正确处理中文字符串,它得到的只是字符串所占的

字节数。对于GB2312的中文编码,strlen得到的值是汉字个数的2倍,而对于UTF-8编码的中文,就是3倍的差异

了(在UTF-8编码下,一个汉字占3个字节)。

采用mb_strlen函数可以较好地解决这个问题。mb_strlen的用法和strlen类似,只不过它有第二个可选参数用于

指定字符编码。例如得到UTF-8的字符串$str长度,可以用mb_strlen($str,'UTF-8')。如果省略第二个参数,则

会使用PHP的内部编码。内部编码可以通过mb_internal_encoding()函数得到。需要注意的是,mb_strlen并不是

PHP核心函数,使用前需要确保在php.ini中加载了php_mbstring.dll,即确保“extension=php_mbstring.dll”

这一行存在并且没有被注释掉,否则会出现未定义函数的问题。

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