using rand php code example

Example 1: random number generator in php

you can use rand() function for that in php.
Example:
Generate random numbers between 1 to 50
<?php
  echo rand(1,50);
?>

Example 2: randhex php

function random_part() {
    return str_pad( dechex( mt_rand( 0, 255 ) ), 2, '0', STR_PAD_LEFT);
}

function randomHEX($amount) {
  $_result = "";
  for ($i = 0 ; $i < $amount; $i++) {
    $_result .= random_part();
  }
  return $_result;
}

//to get a 16 HEX number
echo randomHEX(8);