How to generate non-repeating random strings in php

How to generate non-repeating random strings in php: 1. Use the timestamp as the original string, then randomly generate five characters and insert them randomly into any position to generate a new string. The code is [$position=rand ()%strlen($chars)]; 2. Use the [array_slice] function to randomly extract.

How to generate non-repeating random strings in php:

1. Use the timestamp as the original string, and then randomly generate five characters Randomly insert into any position and generate a new string, ensuring no repetition

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;
    }

2. Use the array_slice() function to randomly extract

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