Generate referral code

generate-referral-code.php

<?php

use Illuminate\Support\Str;

function generateReferralCode($str) {
  // get random number min & max 4 digit
  $randomNumber = rand(1000, 9999);
  // get the first 4 character and trim whitespace
  $strName = trim(substr($str, 0, 4));
  // get str length
  $strLen = strlen($strName);

  // If str length less then 4 add missing x character by random str
  $substrName = $strLen < 4 ? $strName . Str::random(4 - $strLen) : $strName;
  // make name uppercase and concat with the random number
  $referral = strtoupper($substrName) . $randomNumber;
  
  return $referral;
}

Hello