php generates unique strings

PHP generates non-repeating strings

Use the timestamp as the original string and randomly generate five characters Insert randomly into any position to generate a new string, ensuring no duplication.

The code is as follows:
##

function rand($len)
    {
        $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz';
        $string=time();
        for(;$len>=1;$len--)
        {
            $position=rand()%strlen($chars);
            $position2=rand()%strlen($string);
            $string=substr_replace($string,substr($chars,$position,1),$position2,0);
        }
        return $string;
    }

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