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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