How to implement non-repeating strings in php

How to implement non-repeating strings in php: First create a PHP sample file; then use the "function rand($len){...}" method to generate non-repeating random strings.

The operating environment of this tutorial: Windows 7 system, PHP version 5.6. This method is suitable for all brands of computers.

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How to implement non-repeating strings in php:

php Generate a non-repeating random string

Use the timestamp as the original string, then randomly generate five characters and insert them randomly into any position to 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;
    }

• This method is applicable to all computer models.

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