convert bytes to kilobytes in php code example

Example: convert gb to bytes php

<?php 
  function tobytes($size, $type)
  {
    $types = array("B", "KB", "MB", "GB", "TB", "PB"); //You can add the rest if needed..
    
    if($key = array_search($type, $types))
      return $size * pow(1024, $key);
    else return "invalid type";
  }
  
  echo tobytes(15, "MB"); //15728640
  echo tobytes(2, "KB"); //2048
  echo tobytes(3, "w/e"); //invalid type 
?>