How to solve the problem of garbled Chinese string interception in PHP

php Chinese string interception garbled solution: first create a PHP sample file; then define a "utf_substr" method; finally use "substr" and other functions to implement PHP interception of "UTF-8" strings, and Just solve the half-character problem.

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php intercepts utf-8 Chinese string garbled Solution

/**
* PHP截取UTF-8字符串，解决半字符问题。
* 英文、数字（半角）为1字节（8位），中文（全角）为2字节
* @return 取出的字符串, 当$len小于等于0时, 会返回整个字符串
* @param $str 源字符串
* $len 左边的子串的长度
*/
function utf_substr($str,$len){
    for($i=0;$i<$len;$i++){
        $temp_str=substr($str,0,1);
        if(ord($temp_str) > 127){
            if($i<$len){
                $new_str[]=substr($str,0,3);
                $str=substr($str,3);
            }
        }else{
            $new_str[]=substr($str,0,1);
            $str=substr($str,1);
        }
    }    
    return join($new_str);}

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