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Using the isset function in php I want to display a confirmation message but its not showing properly


Bhekstar007
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Basically I created a leapyear calculator, but to improve user experience i want it to display a message on the webpage confirming whether or not the year entered is a leapyear without changing the webpage. However I keep getting '1 is not leap year' regardless of the the year I enter. What am I doing wrong?

<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>Leap year form</title>
</head>
<body>
<?php
$year = isset($_GET["leapyear"]);
function is_leapyear($year){

	if(is_numeric($year)){
		if($year%4 ==0)
			if($year%100 ==0)
				if($year%400 ==0){
					return true;
				}
				return false;
}
}
if (isset($_GET["confirm"])){
if (is_leapyear($year)){
			echo'<span style="color:#008631;">';
			echo"$year is a leap year</span>";
			}
		else
		{
			echo'<span style="color:#FF0000;">';
			echo "$year is not a leap year</span>";
		}
}
?>
<h1>Leap Year</h1> 
<form action = "leapyear_selfcall.php" method = "get" >
<label for="leapyear">Enter a year</label>
<input type="text" name="leapyear"/>
<p><input type="submit" name="confirm" value="Check For Leap Year"/></p>
 </form>
</body>
</html>

 

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  • Solution

try

<?php
if (isset($_GET["leapyear"]) && !empty($_GET['leapyear'])) {
    
    $result =  (is_leapyear($_GET["leapyear"])) ?
                   "<span style=\"color:#008631;\">{$_GET['leapyear']} is a leap year</span>"  :
                   "<span style=\"color:#FF0000;\">{$_GET['leapyear']} is not a leap year</span>" ;
}
else $result = '' ;

function is_leapyear($year){

    if(is_numeric($year)){
        if($year%4 == 0) {
            if($year%100 == 0) {
                return ($year%400 == 0);
            }
            else return true; 
        }
    }
    return false;
}

?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>Leap year form</title>
</head>
<body>

<?= $result ?>

<h1>Leap Year</h1> 
<form  method = "get" >
<label for="leapyear">Enter a year</label>
<input type="text" name="leapyear" id="leapyear" autofocus/>
<p><input type="submit" name="confirm" value="Check For Leap Year" /></p>
 </form>
</body>
</html>

 

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function is_leapyear($year){

    if(is_numeric($year)){
        if($year%4 == 0) {                       // if it's divisible by 4 its probably a leapyar
            if($year%100 == 0) {                 // but check the century condition
                return ($year%400 == 0);         // if its divisible by 400 return true otherwise return false
            }
            else return true; 
        }
    }
    return false;                                // if we get to here, return false
}

 

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