西里尔字符串的Php长度使其值增加一倍 [英] Php length of cyrillic string doubles its value

问题描述

你好这里是问题：
当我得到$ _POST拉丁字符串strilen（）工作完美，但当我得到西里尔字符串strlen（）加倍它的值在这里是代码：

Hello here it is the problem: when i get to the $_POST latin string strilen() works perfectly, but when i get cyrillic string strlen() doubles its value here is the code:

$word = $_POST['word'];
echo strlen($word) . '<br>'; //input: abc -> returns 3, input: абв -> returns 6 
var_dump($word); //input: abc -> returns string 'abc' (length=3), input: абв -> returns string 'абв' (length=6)

你有一些想法吗？

Do you have some ideas?!

推荐答案

strlen 不会重复任何事情，它只是报告情况。具体来说，它会报告多少个字符，而不是多少个字符组成字符串。那是因为 strlen 不知道什么是字符，盲目地假定1个字节= 1个字符。因此，我们说 strlen 不是多字节感知。

strlen does not double anything, it simply reports what the situation is. Specifically, it reports how many bytes -- and not how many characters -- make up the string. That is because strlen does not have any knowledge of what a "character" is, and blindly assumes that 1 byte = 1 character. Therefore we say that "strlen is not multibyte-aware".

在你的情况下，看起来浏览器将UTF-8编码数据提交到服务器。在UTF-8中，西里尔字符是每个字符两个字节。

In your case, it seems that the browser submits UTF-8 encoded data to the server. In UTF-8, cyrillic is two bytes per character.

如果要查找字符串中的字符数，请使用多字节感知 mb_strlen ：

If you want to find out the number of characters in the string, use the multibyte-aware mb_strlen:

echo mb_strlen($word, 'UTF-8');

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