SQLSTATE[HY093]: INVALID PARAMETER NUMBER: PARAMETER WAS NOT DEFINED error on form

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Hi I am trying to validate my register form and i am getting the below error:

SQLSTATE[HY093]: INVALID PARAMETER NUMBER: PARAMETER WAS NOT DEFINED

This is when I leave the first name field empty. however does provide me with an error message but also has this. See below the code i have. I want to validate it all but just doing one step at a time

What I have tried:

PHP

if(isset($_POST['submit'])){
	
if (empty($_POST['FirstName']))
	{
		
		$error[] = 'Please enter your Forename';
	}

	else 
	{
		$stmt = $conn->prepare('SELECT FirstName FROM Profile WHERE FirstName = :FirstName');
		$stmt->execute(array(':FirstName' => $_POST['FirstName']));
		$row = $stmt->fetch(PDO::FETCH_ASSOC);
	}

	try {

			//insert into database with a prepared statement
			$stmt = $conn->prepare('INSERT INTO Profile (FirstName, Password,  EmailAddress, DueDate) VALUES (:FirstName,  :password, :email, :duedate)');
			$stmt->execute(array(
				':FirstName' =>$_POST['FirstName'],
				$_POST['password'],	
				$_POST['email'],	
				$_POST['dueDate']	
				));

Posted 25-Jan-18 4:13am

Member 13625812

Updated 29-Nov-22 15:58pm

Chris Maunder772.7K

v2

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Member 15848308 · Answer 1 · 2022-11-29T12:51:00

I know this is old, but in case someone else lands here looking for a similar solution, this might be it:

The last three parameters in the execute array are indexed, when they need to have associative keys that match the prepared placeholders, like this:

PHP

$stmt->execute(array(
				':FirstName' =>$_POST['FirstName'],
				':password'=>$_POST['password'],	
				':email'=>$_POST['email'],	
				':duedate'=>$_POST['dueDate']	
				));