When you are upgrading a WordPress plugin or theme to be compatible with PHP 7.2.x, here is a pattern on how to update while = each() loops to foreach() loops.
Case 1: Missing $value
reset($array);
while (list($key, ) = each($array)) {Update to:
foreach(array_keys($array) as $key) {Case 2: Missing $key
reset($array);
while (list(, $value) = each($array)) {Update to:
foreach($array as $value) {Case 3: Not missing anything
reset($array);
while (list($key, $value) = each($array)) {Update to:
foreach($array as $key => $value) {
Previous article
Changing or Updating Your Version of PHP for WordPress
Next article
