Warum den Code nicht für Schaltjahre ausführen?

Question

<form action="abc.php" method="post">

<input type="text" name="nianfen"/>

<input type="submit" name= "Senden"/>

</form>

<?php

$n = $_POST['nianfen'];

if($n<0| |!is_numeric($n)){

echo 'Bitte geben Sie das richtige Jahr ein';

exit

}

if($n.'%'.'400'==0){

echo 'Leap Year';

Exit;

}

if($n.'%'.'4'==0&&(!($n.'%'.'100 ' ==0))){

echo 'Leap Year';

Exit;

}

else{

Echo 'normales Jahr';

Exit;

}

.

...

?>

Answer 1

<?php

$year = $_GET['year'];

//判断输入的年份是否是数值

if(!is_numeric($year)){

echo '请输入数值类型';

}

//如果是数值，就判断是否是闰年或者平年

if($year%100==0){

if($year%400==0 && $year%3200!=0){

echo "世纪年" . $year . "是闰年";

}else{

echo "世纪年" . $year . "是平年" ;

}

}else{

if($year%4==0 && $year%100!=0){

echo "普通年" . $year . "是闰年";

}else{

echo "普通年" .$year . "是平年";

}

}

?>