loop throght a string?

[zzz]

If I have a string of user ids, how can I loop through it to perform a task?

$userIDs = '22, 232,3434, 333';

[NogDog]

You could [man]explode/man it on the comma, then loop through the resulting array.

[Kudose]

Depends on what you want to work with.

To get the user IDs into an array, I would use

$arr = explode(',', $userIDs);
$arr = array_map('trim', $arr);

To traverse the string, you can use

$len = strlen($userIDs);
for($i = 0; $i < $len; $i++){
  $char = $userIDs[$i];
  // do something with it
}