PHP Generate Key

PHP Generate Key randomly 

<?php

function generateRandomString($length = 32) {

          $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

          $charactersLength = strlen($characters);

          $randomString = '';

          for ($i = 0; $i < $length; $i++) {

              $randomString .= $characters[rand(0, $charactersLength - 1)];

          }

          return $randomString;

      }

      echo generateRandomString();

?>

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