[PHP] Add a leading zero

[Shaun]

Hi,

How can i add a leading zero to the first result of this loop so that i get
00, 15, 30, 45?

    <select name="start_date_minute">
     <?php
      $i = 0;
      while ($i <= 45){
       echo '<option value="'.$i.'">'.$i.'</option>';
       $i+=15;
      }
     ?>

Thanks for your help

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