Example of string interception function mb_substr in php

string mb_substr ( string $str , int $start [, int $length = NULL [, string $encoding = mb_internal_encoding() ]] )-Intercept string

(PHP 4 >= 4.0.6, PHP 5)
$str To get the target string of the string (the starting position of the string is 0)
$start, the first character to be used in $str Position
$length, the length of the obtained substring (note that it is not the end position)
$encoding, you can specify the character encoding (generally used when processing Chinese characters, and this problem is encountered a lot)

<?php
mb_internal_encoding ("UTF-8");    //如果把UTF-8改为编码,下面针对于中文字符串处理的值会改变。
echo mb_internal_encoding()."";    //获取字符编码为ISO-8859-1
echo mb_substr(&#39;abcdefghijk&#39;,0,9)."";    //abcdefghi
echo mb_substr(&#39;abcdefghijk&#39;,1,5)."";    //bcdef
echo mb_substr(&#39;我们都是中国人&#39;,0,9)."";    //我们都是中国人
echo mb_substr(&#39;我们都是中国人&#39;,0,9,&#39;gb2312&#39;)."";    //我们都是中
echo mb_substr(&#39;我们都是中国人&#39;,0,9,&#39;utf-8&#39;);    //我们都是中国人
?>

Summary:
1. When processing English strings, the fourth parameter ($encoding) of this function can be ignored.
2. When processing Chinese strings, be careful and must consider encoding issues. Different encodings have different Chinese values.
3. When Chinese strings are imported into the database, it becomes even more important.
4. The coding ability to process strings or text is a criterion for measuring a programmer's skill.

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