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In PHP, if a form POSTS to itself, must I use a SESSION variable to get that info to another page?

In PHP, if a form POSTS to itself, must I use a SESSION variable to get that info to another page?
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Just a simple single-page validation create user form.  To clarify, the POST information in the array is not available to other pages by default without additional steps to transfer the data?
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The form submits to itself.
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So should i just set the following POST array to a SESSION array to capture the data from the form for an "account created" page which shows what the user entered?

	if(isset($_POST["submit"])) {
	  	$first_name = $_POST["first_name"];
	  	$last_name = $_POST["last_name"];
	  	$user_name = $first_name[0] . "_" . $last_name;
	  	$access_level = $_POST["access_level"];
		$department = $_POST["department"];
		$password = $_POST["password"];
	  	$password2 = $_POST["password2"];
		 	

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When I do a var_dump on the page redirected to (account_created.php) it says the array is empty.  Any ideas why this is happening?

<?php session_start();?> 
<?php require_once("includes/functions.php"); ?>
<?php require_once("includes/db_connection.php"); ?>


<?php
      
$result = "";

/*$existing_user_check = "SELECT user_name from users";

$result = mysqli_query($connection, $existing_user_check);

	  
while($row = mysqli_fetch_assoc($result)) {
var_dump($result);
}  */
	  
	  
	  $errors = array();  
		
		if(isset($_POST["submit"])) {
	  	$first_name = $_POST["first_name"];
	  	$last_name = $_POST["last_name"];
	  	$user_name = $first_name[0] . $last_name;
	  	$access_level = $_POST["access_level"];
		$department = $_POST["department"];
		$password = $_POST["password"];
	  	$password2 = $_POST["password2"];
		 	
			 if ($password !== $password2) {
				$errors[] = "Passwords do not match, please re-enter";  
					 if (empty($password)) {
						 $errors[] = "Password is empty, please enter a password";
					 }
					 
					  } else {
						$query = "INSERT INTO users (first_name, last_name, user_name,  department, password, password2, access_level) VALUES (";
						$query .= "'{$first_name}', '{$last_name}', '{$user_name}',  '{$department}', '{$password}', '{$password2}', '{$access_level}')";
						$result = mysqli_query($connection, $query);
					
		$first_name = $_SESSION["first_name"];
	  	$last_name = $_SESSION["last_name"];
	  	$user_name = $first_name[0] . $last_name;
	  	$access_level = $_SESSION["access_level"];
		$department = $_SESSION["department"];
		$password = $_SESSION["password"];
	  	$password2 = $_SESSION["password2"];
	
		redirect_to("account_created.php");
					  }
	} else {
  
	  	$first_name = "";
	  	$last_name = "";
	  	$user_name = "";
	  	$access_level = "";
		$department = "";
		$password = "";
	  	$password2 = "";
	  	$message = "Please log in";
	}



?>

<?php
$options = array("user", "administrator");
$html_options = "";
?>


<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
<link href="default.css" rel="stylesheet" type="text/css">
</head>

<body>
<div>
<h1>Please create user</h1>


<form action="create_user.php" method="post">
<table  width = "400" border="0" cellspacing="0" cellpadding="2">
  <tr>
    <td>Enter First Name</td>
    <td><input name="first_name" type="text" value="<?php echo $first_name ?>"></td>
  </tr>
  <tr>
    <td>Enter Last Name</td>
    <td><input type="text" name="last_name" value="<?php echo $last_name ?>"> </td>
  </tr>
  <tr>
    <td>Enter Password</td>
    <td> <input type="password" name="password"> </td>
  </tr>
  <tr>
    <td>Re-Enter Password</td>
    <td><input type="password" name="password2"></td>
  </tr>
   <tr>
    <td>Set Access level</td>
    <td><select name="access_level" id="access_level">
      
<?php
		
foreach ($options as $option) {
	
	$selected = ($access_level == $option)  ? "selected" : "";
	$html_options .=  "<option value='{$option}' {$selected}>{$option}</option>";
	}

echo $html_options;

?>
    
      
    </select></td>
  </tr>
    <td>Department</td>
  <td><select name="department" id="department">
    <option value="administration">Administration</option>
    <option value="research">Research</option>
    <option value="sales">Sales</option>
    <option value="trading">Trading</option>
  </select></td>
  </tr>
</table>





<input name="submit" type="submit" id="submit">
</form>

</div>




</body>
</html>

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