Print Current Day to End Day of Month in PHP

<?php
$datetime_start = strtotime(date('D Y/m/d'));
$datetime_end   = strtotime(date("D Y/m/d",mktime(0, 0, 0, (date('m') + 1), 0, date('Y'))));

$datetime_temp = $datetime_start;
?>

<select class="input-box" name="">
<?php while ($datetime_temp <= $datetime_end) { ?>
<option><?php echo date('D d/m/Y', $datetime_temp); ?></option>
<?php
$datetime_temp = strtotime('+1 day', $datetime_temp);  
}
?>
</select>