SQL query to update item quantity using PHP PDO

Good morning everyone

I am trying to update the table with the new quantity selected, when I run the following function, however, I get this error:

Fatal error: Uncaught PDOException: SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens in C:xampphtdocsphp_AssessmentsshoppingListmodelfunctions_products.php:11 Stack trace: #0 C:xampphtdocsphp_AssessmentsshoppingListmodelfunctions_products.php(11): PDOStatement->execute() #1 C:xampphtdocsphp_AssessmentsshoppingListcontrollerproduct_update_process.php(21): update_item('57', '3', '1') #2 {main} thrown in C:xampphtdocsphp_AssessmentsshoppingListmodelfunctions_products.ph

Function to update the quantity, function_products.php:

<?php
function update_item($soldID, $orderedQuantity, $itemQuantity)
{
  global $conn;
  $sql = "UPDATE shopping_items.sold SET orderedQuantity = :itemQuantity WHERE soldID = :soldID";
  $statement = $conn->prepare($sql);
  $statement->bindValue(':soldID', $soldID);
  $statement->bindValue(':orderedQuantity', $orderedQuantity);
  $statement->bindValue(':itemQuantity', $itemQuantity);
  $result = $statement->execute();
  $statement->closeCursor();
  return $result;
}

?>

product_update_process.php

<?php
// Require database connection
require('connection.php');
// Require function
require_once("../model/functions_products.php");
// Fetch the data required
$soldID = $_GET['soldID'];
$itemQuantity = $_POST['itemQuantity'];
$orderedQuantity = $_POST['orderedQuantity'];
if(empty($itemQuantity)) {
   echo '<script type="text/javascript">alert("The quantity is required.")</script>' ;
   // Redirect the browser window back to the add customer page
    echo "<script>setTimeout("location.href = '../index.php';",2000);</script>";
} else {
    //call the update_item() function
    $result = update_item($soldID, $itemQuantity, $orderedQuantity);
    // Redirect the browser window back to the admin page
    header("location: ../index.php"); 

}


?>

What could be the issue here?

Thanks for your assistance.

Answer

To add to @TangentiallyPerpendicular’s comment, why are you binding to :orderedQuantity? This variable is not being used in your SQL statement, even though you have told the SQL engine to expect the variable. The column doesn’t need to be a variable in order pass a variable to it.