Example why to initiate variables first versus on-demand initiation inside loop

foreach-for-loop-example

<?php
// test for efqs
/**
 * Root directory of Drupal installation.
 */
define('DRUPAL_ROOT', getcwd());
require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
// turn error reporting back to normal
error_reporting(E_ALL);
// global $user;
// $user = user_load(1);

if (!function_exists('krumo')) {
  has_krumo();
}

krumo("foreach example a.");
foreach (chris_test() as $key) {
  krumo($key);
}

krumo("foreach example b.");
$chris_test = chris_test();
foreach ($chris_test as $key) {
  krumo($key);
}

krumo("for loop example a.");
for ($i = 0; $i < chris_test2(); $i++) {
  krumo($i);
}

krumo("for loop example b.");
$limit = chris_test2();
for ($i = 0; $i < $chris_test2; $i++) {
  krumo($i);
}

function chris_test() {
  krumo(__FUNCTION__);
  return array('a', 'b', 'c', 'd', 'e');
}

function chris_test2() {
  krumo(__FUNCTION__);
  return 2;
}

?>