I am trying to loop through dates with PHP. Currently my code gets stuck in a loop repeating 110307. I need the date format to be in yymmdd. Here is what I was trying to use:

```
<?php
    $check_date = '100227';
    $end_date = '100324';

    while($check_date != $end_date){
        $check_date = date("ymd", strtotime("+1 day", strtotime($check_date)));
        echo $check_date . '<br>';  
    }
?>

```