PHP Debugging problem #1 with solution

<!DOCTYPE HTML>  
<html>
<head>
</head>
<body>  

<?php
// define variables and set to empty values

$array_items = []; 
$name = $email = $comment = $website = "";
if ($_SERVER["REQUEST_METHOD"] == "POST") 
{

  $name = test_input($_POST["name"]);
  $city = test_input($_POST["city"]);
  $month = test_input($_POST["month"]);
  $year = test_input($_POST["year"]);
  array_push($array_items, "$name", "$city","$month", "$year");
  echo "In $array_items[1] in the month of $array_items[2] $array_items[3], you observed 
  the following weather: <br>" ;
 foreach($_POST['weather'] as $item){
    echo $item . "\n";

}

function test_input($data) 
{
  $data = trim($data);
  $data = stripslashes($data);
  $data = htmlspecialchars($data);
  return $data;
}
?>

<h2>PHP Form Validation Example</h2>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 
  Weather you experienced : <input type="text" name="name">
  City : <input type="text" name="city">
  Month : <input type="text" name="month">
  Year : <input type="text" name="year">
  <br><br>
  <input type="submit" name="submit" value="Submit">  
</form>

<form action="#" method="post">
<input type="checkbox" name="weather[]" value="rain">rain</input> <br>
<input type="checkbox" name="weather[]" value="sunshine">sunshine</input><br>
<input type="checkbox" name="weather[]" value="clouds">clouds</input><br>
<input type="checkbox" name="weather[]" value="hail">hail</input><br>
<input type="checkbox" name="weather[]" value="sleet">sleet</input><br>
<input type="checkbox" name="weather[]" value="snow">snow</input><br>
<input type="checkbox" name="weather[]" value="wind">wind</input><br>
<input type="submit" name="submit" value="Submit"/>
</form>

</body>
</html>

So the issue here was that that I had declared two separate forms but only one "$_SERVER["REQUEST_METHOD"] == "POST" to cater the post request. So since I wanted both the forms result, I merged both of them in one form.

<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 
  Weather you experienced : <input type="text" name="name">
  City : <input type="text" name="city">
  Month : <input type="text" name="month">
  Year : <input type="text" name="year">
  <br><br>
  <input type="submit" name="submit" value="Submit">  

<input type="checkbox" name="weather[]" value="rain">rain</input> <br>
<input type="checkbox" name="weather[]" value="sunshine">sunshine</input><br>
<input type="checkbox" name="weather[]" value="clouds">clouds</input><br>
<input type="checkbox" name="weather[]" value="hail">hail</input><br>
<input type="checkbox" name="weather[]" value="sleet">sleet</input><br>
<input type="checkbox" name="weather[]" value="snow">snow</input><br>
<input type="checkbox" name="weather[]" value="wind">wind</input><br>
<input type="submit" name="submit" value="Submit"/>
</form>