PHP Chinese processing Chinese string interception (mb_substr) and obtaining the number of Chinese string characters

1. Chinese interception: mb_substr()

mb_substr( $str, $start, $length, $encoding )

$str, the string that needs to be truncated
$start , the starting point of truncation, the starting point is 0
$length, the number of words to be intercepted
$encoding, web page encoding, such as utf-8, GB2312, GBK

Example:

<?php 
$str=&#39;PHP中文网：http://www.php.cn&#39;; 
echo mb_substr($str,0,4,&#39;utf-8&#39;);//截取头5个字，假定此代码所在php文件的编码为utf-8 
?> 
结果显示：PHP中文网

2. Get the Chinese length: mb_strlen()

mb_strlen( $str, $encoding )

$str, the string to calculate the length
$encoding, web page encoding, such as utf-8, GB2312, GBK

Example:

<?php 
$str=&#39;PHP中文网：http://www.php.cn&#39;; 
echo mb_strlen($str,&#39;utf-8&#39;);//假定此代码所在php文件的编码为utf-8 
?> 
结果显示：24

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