Date Picker Select Generator for HTML & PHP

html-php-date-picker.php

<select name="year">
  <option value="">Year</option>
  <?php for ($year = date('Y'); $year > date('Y')-100; $year--) { ?>
	<option value="<?php echo $year; ?>"><?php echo $year; ?></option>
	<?php } ?>
</select>
<select name="month">
	<option value="">Month</option>
	<?php for ($month = 1; $month <= 12; $month++) { ?>
	<option value="<?php echo strlen($month)==1 ? '0'.$month : $month; ?>"><?php echo strlen($month)==1 ? '0'.$month : $month; ?></option>
	<?php } ?>
</select>
<select name="day">
  <option value="">Day</option>
	<?php for ($day = 1; $day <= 31; $day++) { ?>
	<option value="<?php echo strlen($day)==1 ? '0'.$day : $day; ?>"><?php echo strlen($day)==1 ? '0'.$day : $day; ?></option>
	<?php } ?>
</select>

hello ! if month:3 day just have 29, how to write ? when user choice month ,day will change.

@DevJacobZhang, this one was just for a simple input. It's better to use some javascript date picker for that.