PHP realizes string flipping (including Chinese characters) php randomly generates strings php gets the string length php string ratio

<?php header("content-type:text/html;charset=utf-8");
 /**
此函数的作用是反转中文字符串
mb_strlen() 获取字符的长度
mb_substr() 获取字符的单个元素
krsort() 按照键值逆序排序数组
implode() 将数组拼接为字符串
explode() 使用字符串分隔字符串
 */
functionstr_rev_gb($str){
    //判断输入的是不是utf8类型的字符，否则退出
    if(!is_string($str)||!mb_check_encoding($str,&#39;UTF-8&#39;)){
        exit("输入类型不是UTF8类型的字符串");
    }
    $array=array();
    //将字符串存入数组
    $l=mb_strlen($str,&#39;UTF-8&#39;);
    for($i=0;$i<$l;$i++){
        $array[]=mb_substr($str,$i,1,&#39;UTF-8&#39;);
    }
    //反转字符串
    krsort($array);
    //拼接字符串
    $string=implode($array);
    return$string;
}
$str1= "Englist";
$str2= "English中国";
$str3= "Eng中lish国";
$str4= "中华人民共和国";
echo$str1."->".str_rev_gb($str1)."<br>";
echo$str2."->".str_rev_gb($str2)."<br>";
echo$str3."->".str_rev_gb($str3)."<br>";
echo$str4."->".str_rev_gb($str4)."<br>";

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<?PHP function getRev($str,$encoding=&#39;utf-8&#39;){
        $result = &#39;&#39;;
        $len = mb_strlen($str);
        for($i=$len-1; $i>=0; $i--){
            $result .= mb_substr($str,$i,1,$encoding);
        }
        return$result;
    }
    $string = 'OK你是正确的Ole';
    echo getRev($string);

?>

The above introduces the implementation of string flipping in PHP (including Chinese characters), including string and PHP content. I hope it will be helpful to friends who are interested in PHP tutorials.