Checking Leap year conditional in PHP does not work - php

Question

I'm trying to figure out how to apply a conditional to check if a year is a Leap year or Not. But when I add the leap function it just does not work.
Any idea how to make it work?
This is my code :
<?php
$name = "";
$character = "";
$email = "";
$birth_year = 1969;
$validation_error = "";
$existing_users = ["admin", "guest"];
$options = ["options" => ["min_range" => 1920, "max_range" => date("Y")]];
function leap($year) {
date('L', strtotime("$year-01-01")) ? TRUE : FALSE;
}
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$raw_name = trim(htmlspecialchars($_POST["name"]));
if (in_Array($raw_name,$existing_users)){
$validation_error .= "This name is taken. <br>";
} else {
$name = $raw_name;
}
$raw_character = $_POST["character"];
if (in_array($raw_character,["wizard", "mage", "orc"])) {
$character = $raw_character;
} else {
$validation_error .= "You must pick a wizard, mage, or orc. <br>";
}
$raw_email = $_POST["email"];
if (filter_var($raw_email,FILTER_VALIDATE_EMAIL)) {
$email = $raw_email;
} else {
$validation_error .= "Invalid email. <br>";
}
$raw_birth_year = $_POST["birth_year"];
if (filter_var($raw_birth_year,FILTER_VALIDATE_INT,$options)){
$birth_year = $raw_birth_year;
if ($raw_character === "mage") {
if (!leap($birth_year)){
$validation_error .= "Mages have to be born on leap years. <br>";
}}
} else {
$validation_error .= "That can't be your birth year. <br>";
}
}
?>
<h1>Create your profile</h1>
<form method="post" action="">
<p>
Select a name: <input type="text" name="name" value="<?php echo $name;?>" >
</p>
<p>
Select a character:
<input type="radio" name="character" value="wizard" <?php echo ($character=='wizard')?'checked':'' ?>> Wizard
<input type="radio" name="character" value="mage" <?php echo ($character=='mage')?'checked':'' ?>> Mage
<input type="radio" name="character" value="orc" <?php echo ($character=='orc')?'checked':'' ?>> Orc
</p>
<p>
Enter an email:
<input type="text" name="email" value="<?php echo $email;?>" >
</p>
<p>
Enter your birth year:
<input type="text" name="birth_year" value="<?php echo $birth_year;?>">
</p>
<p>
<span style="color:red;"><?= $validation_error;?></span>
</p>
<input type="submit" value="Submit">
</form>
<h2>Preview:</h2>
<p>
Name: <?=$name;?>
</p>
<p>
Character Type: <?=$character;?>
</p>
<p>
Email: <?=$email;?>
</p>
<p>
Age: <?=date("Y")-$birth_year;?>
</p>
Im using this function to find if a year is Leap or not
function leap($year) {
date('L', strtotime("$year-01-01")) ? TRUE : FALSE;
}
And this is the conditional that does not work :(
if ($raw_character === "mage") {
if (!leap($birth_year)){
$validation_error .= "Mages have to be born on leap years. <br>";
}}

Answer 1

I think your problem is the function is not returning anything, try :
function leap($year) {
return date('L', strtotime("$year-01-01")) ? TRUE : FALSE;
}