为每个创建3个selectbox（月，日，年）php循环选项，并在`months`更改时更改`days`的选项

Question

I have these select boxes as follow:

<?php 
echo'
<select id="months"></select>

<select id="days"></select>

<select id="years"></select>
'; ?>

I want the options for each select boxes to be the current date to be automatically selected on load. Like for example today(January 28, 2016): the first select box should have January selected. and the next one should be 18, and the last 1 should be 2016.

Actually I already got that working for the days select box with this code.

for ($x = 1; $x <= 31; $x++) {
        echo '<option value="'.$x.'" ';

        if ($x == date_format($nowdate,'d'))
        {
            echo 'selected';
        }
        echo' >'.$x.'</option>';
        }

But I don't know how to do it on months. And 1 more problem, I want when months changes, the days should also change its options depending on the number of days the selected month has. Any help would be greatly appreciated. Thanks.

Consider 2000-3000 as options included for years Select box

Answer 1

You can try the below code for populating months :

    for ($x = 1; $x <= 12; $x++) {
        $mon = date('F', mktime(0,0,0,$x));
        echo '<option value="'.$mon.'" ';
        if ($mon == date('F'))
        {
           echo 'selected';
        }
        echo' >'.$mon.'</option>';
    }

Same way, you can use date('Y') to figure out the current year.