How to generate random non-repeating strings in php

php method to randomly generate non-repeating strings: first create a php sample file; then use the timestamp as the original string; then randomly generate five characters and randomly insert them at any position; finally generate a new The string can be.

php method to randomly generate non-repeating strings:

Use the timestamp as the original string, and 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;
     }

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