Question

I’m trying to make a PayPal IPN file but the response won’t be inserted into the database. After a little debugging i found that my function has one error but i don’t know which one.

It seems that the following code is wrong, but i don’t know why. It looks good to me. Am i doing something wrong?

<?php
function check_price($price, $id) {
  $valid_price = false;

  $sql = $wpdb->get_results("SELECT * FROM `webc_products` WHERE id = '$id'");
  foreach ( $sql as $prod ) {
    $num = (float)$prod->amount;
    if($num == $price){
      $valid_price = true;
    }   
  }

  return $valid_price;
}

$a = check_price(0.01, 1);
?>

Also, i tried the code outside the function and somehow it works.

Answer 1

You’re function is accessing the $wpdb object without actually having access to it (variable scope).
Either pass it as a parameter to your function (I’d recommend that) or declare it as global in your function.