这个用户定义的函数用于创建一系列下拉菜单

<?php 
    function make_calender_pulldowns(){
        echo '<select name="year">';
        $year=2005;
        while($year<=2019){
            echo "<option value=\"$year\">$year</option>\n";
            $year++;
        }
        echo '<select>年';
        
        echo '<select name="month">';
        $month=1;
        do{
            echo "<option value=\"$month\">$month</option>\n";
            $month++;
        }while ($month<=12);
        echo '</select>月';
        
        echo '<select naem="day">';
        for($day=1;$day<=12;$day++){
            echo "<option value=\"$day\">$day</option>";
        }
        echo '</select>日';
    }
?>
<form action="" method="post">
	<?php 
        make_calender_pulldowns();	   
	?>
</form>