PDO FETCH_CLASS multiple rows into array of objects - php

Question

I'm trying to fetch multiple rows of bookings from a database and I want each one to be an instance of a specific class - so I attempted to store them within a multidimensional array.
So far it works in terms of creating the array of objects, however I need the index for the array to be the booking ID so that I can easily access each one. For example:
$bookings[id] => booking Object ( [name:protected] => name, [time:protected] => time )
Is this possible and is it the best way to go about what I want to achieve? Any help would be hugely appreciated, here's the code:
class create_bookings {
private $db;
protected $error;
function __construct($db, $current, $end) {
$this->db = $db;
$query = "SELECT id, name, time
FROM bookings";
$stmt = $this->db->prepare($query);
$stmt->execute();
$result = $stmt->fetchAll(PDO::FETCH_CLASS, 'booking');
print_r($result);
}
}
...and the 'booking' class is just a set of properties:
class booking {
private $db;
protected $name;
protected $time;
}

Answer 1

Instead of building a class to create the booking objects, it would be advisable to either create a standalone function, or a function within a parent class to achieve this. The issue I run in to with using fetchAll() with the FETCH_CLASS parameter, is that the objects do not automatically have access to the database object, causing you to need to iterate over the objects afterwards anyways, so I simply build the __construct() method to capture the $db and generated array.
Assuming you go the route of a standalone function:
function create_bookings($db, $current, $end) {
$query = "SELECT id, name, time
FROM bookings";
$stmt = $db->prepare($query);
$stmt->execute();
$result = array()
$bookings = $stmt->fetchAll();
if($bookings) {
foreach($bookings as $booking) {
$result[$booking['id']] = new booking($db, $booking);
}
}
return $result;
}
class booking {
private $db;
public $id;
public $name;
public $time;
public function __construct($db, $array) {
if(/*validate your array here*/) {
$this->db = $db;
$this->id = $array['id'];
$this->name = $array['name'];
$this->time = $array['time'];
}
}
}

Answer 2

Yes there is a way to do this.
The trick is PDO::FETCH_GROUP. Just do
$result = $stmt->fetchAll(PDO::FETCH_GROUP|PDO::FETCH_CLASS, 'booking');
The only downside to this is that there will be an array in every result before the Object
There's a simple way to remove the array too
$output= array_map('reset',$result);