The php date function formats and outputs the time in the specified range

/**
* The date function formats and outputs the time in the specified range
* by bbs.it-home.org
*/
$stand = "2013-01-";

for ($i = 1; $i  $time = strtotime($stand . $i);
 $date[] = date("Ymd", $time);
}

print_r($date);
?>

Achieve the effect: attached, The date function gets the date of the previous or next day example:

//Date definition
$day = date("Ymd", strtotime("-1 day"));
echo $day."n";
$day = date( "Ymd", strtotime("+1 day"));
echo $day."n";

The effect is as follows: