get the correct time period in php

1. the following is correct


$beginTime = 1193893200;
  $endTime = 1194242400;
  for ($myDate = $beginTime; $myDate <= $endTime; $myDate = strtotime("+1 day", $myDate)) {
     $printable = strftime("%Y-%m-%d %H:%M:%S", $myDate);
     echo $printable.'<br/>';
  }


2 the following is wrong


$beginTime = '2007-11-01';
 $endTime = '2007-11-05';


while (strtotime($beginTime) <= strtotime($endTime)) {
   echo $beginTime."<br />";


   $beginTime = date("Y-m-d", strtotime($beginTime)+(60*60*24));
   $i++;


   if ($i > 10) {
    break;
   }
  }