Question

I’m defining models that share a common database. However, I’m having trouble passing a PDO object via require_once(). I’m getting the following error:

Fatal error: Call to a member function prepare() on a non-object...

I’m guessing this is just a scope issue. I tried declaring $database as a global in both files but that didn’t seem to work. Any ideas?

common.php

$host = 'localhost';
$dbname = 'database';
$username = 'user';
$password = 'pass';

$database = new PDO("mysql:host=$host;dbname=$dbname", $username, $password, array(PDO::ATTR_PERSISTENT => true));

product.php

require_once('common.php');

class Product {

  function fetch_from_category($category) {
    $query = $database->prepare('SELECT * FROM product WHERE product.category = ?');
    $query->execute($category);
    return $query->fetchAll(PDO::FETCH_ASSOC);
  }

}

Answer 1

It is indeed a scope issue, $database is not defined inside Product::fetch_from_category. You should pass it into the object when instantiating it:

class Product {

  protected $database;

  public function __construct(PDO $database) {
      $this->database = $database;
  }

  public function fetch_from_category($category) {
      $query = $this->database->prepare('SELECT * FROM product WHERE product.category = ?');
      $query->execute($category);
      return $query->fetchAll(PDO::FETCH_ASSOC);
  }

}

…

require_once 'common.php';
require_once 'product.php';

$product = new Product($database);