Solve the problem of flipping Chinese garbled characters in strrev function in PHP

When using strrve in PHP to flip Chinese, garbled characters will appear

For example:

header("Content-Type: text/html; charset=utf-8");
echo strrev("处理使用strrev()函数时的乱码问题")."<br>";

The running result is:

��鮗元籹The solution is to rewrite a cnstrrev function yourself

header("Content-Type: text/html; charset=utf-8");
$str = '处理使用strrev()函数时的乱码问题';
function cnstrrev($str)
{
    $len = strlen($str);
    for($i = 0; $i < $len; $i++)
    {
        $char = $str{0};
        if(ord($char) > 127) //ord()函数取得第一个字符的ASCII码，如果大于0xa0(127)的话则是中文字符
        {
            $i+=2;//utf-8编码的情况下，一个中文字符占三个字节
            if($i < $len)
            {
                $arr[] = substr($str, 0, 3);//utf-8编码的情况下，一个中文字符占三个字节
                $str = substr($str, 3);
            }
        }
        else
        {
            $arr[] = $char;
            $str = substr($str, 1);//否则为非中文，占一个字符
        }
    }
    return join(array_reverse($arr));//以相反的元素顺序返回数组：
}
echo $str.&#39;+&#39;.cnstrrev($str);

The running result is:

Solve the problem of garbled characters when using the strrev() function + the problem of garbled characters) (use verrts to handle

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