What should I do if the string intercepted by php is garbled?

Solution to garbled characters when intercepting strings in php: You can use the inconsistent binary ranges of ASCII encoding and Chinese encoding to distinguish them, and then further intercept the string through the substr() function.

Solution idea:

Use the inconsistent binary ranges of ASCII encoding and Chinese encoding to distinguish them, and then use substr() Implemented by the function of intercepting strings.

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The code is as follows:

Note: This is only for utf-8 encoding

<?php
header(&#39;content-type:text/html;charset=utf-8;&#39;);
$str = &#39;利要a-符e:r ttnx节小-子s区。vh;peh。例t来个oe体字n代gb节看t通c eu是的soS至什tna过码 t;Ie看C实e/,字le A来具8y么a)n=于ndg是r于 0tmt现码 e0ssf8单下s(uo别e的以ieh过aatx和t接要u几这看 nsw Ihrr用字 mgtts上就eg cAei的nwo码e跳h，t编&#39;;
/*
*在某篇文章中截取一段字符串，多余的用省略号...表示，并且防止中文乱码
*$param1 string要截取的字符串 $str  注意：这里是utf-8编码
*$param2 int截取字符串的长度 $len  
*返回值 成功返回所要截取的字符串，失败为空
*/
function str($str=&#39;&#39;,$len=0){
    //检查参数
    if(!is_string($str) || !is_int($len)){
        return &#39;&#39;;
    }
    $length = strlen($str);
    if($length <= 0 ){
        return &#39;&#39;;
    }
    if($len>=$length){
        return $str;
    }
    //初始化，统计字符串的个数，
    $count = 0;
    for($i=0;$i<$length;$i++){
        //达到个数跳出循环，$i即为要截取的长度
        if($count == $len){
            break;
        }
        $count++;
        //ord函数是获取字符串的ASCII编码，大于等于十六进制0x80的字符串即为中文字符串
        if(ord($str{$i}) >= 0x80){
            $i +=2;//中文编码的字符串的长度再加2
        }
    }
    //如果要截取的个数超过了字符串的总个数，那么我们返回全部字符串，不带省略号
    if($len > $count){
        return $str;
    }else{
        return substr($str,0,$i).&#39;...&#39;;
    }
}

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