Array of PHP Objects
PhpArraysObjectPhp Problem Overview
So I have been searching for a while and cannot find the answer to a simple question. Is it possible to have an array of objects in PHP? Such as:
$ar=array();
$ar[]=$Obj1
$ar[]=$obj2
For some reason I have not been able to find the answer anywhere. I assume it is possible but I just need to make sure.
Php Solutions
Solution 1 - Php
The best place to find answers to general (and somewhat easy questions) such as this is to read up on PHP docs. Specifically in your case you can read more on objects. You can store stdObject and instantiated objects within an array. In fact, there is a process known as 'hydration' which populates the member variables of an object with values from a database row, then the object is stored in an array (possibly with other objects) and returned to the calling code for access.
-- Edit --
class Car
{
public $color;
public $type;
}
$myCar = new Car();
$myCar->color = 'red';
$myCar->type = 'sedan';
$yourCar = new Car();
$yourCar->color = 'blue';
$yourCar->type = 'suv';
$cars = array($myCar, $yourCar);
foreach ($cars as $car) {
echo 'This car is a ' . $car->color . ' ' . $car->type . "\n";
}
Solution 2 - Php
Yes.
$array[] = new stdClass;
$array[] = new stdClass;
print_r($array);
Results in:
Array
(
[0] => stdClass Object
(
)
[1] => stdClass Object
(
)
)
Solution 3 - Php
Yes, its possible to have array of objects in PHP.
class MyObject {
private $property;
public function __construct($property) {
$this->Property = $property;
}
}
$ListOfObjects[] = new myObject(1);
$ListOfObjects[] = new myObject(2);
$ListOfObjects[] = new myObject(3);
$ListOfObjects[] = new myObject(4);
print "<pre>";
print_r($ListOfObjects);
print "</pre>";
Solution 4 - Php
Arrays can hold pointers so when I want an array of objects I do that.
$a = array();
$o = new Whatever_Class();
$a[] = &$o;
print_r($a);
This will show that the object is referenced and accessible through the array.
Solution 5 - Php
You can do something like this:
$posts = array(
(object) [ 'title' => 'title 1', 'color' => 'green' ],
(object) [ 'title' => 'title 2', 'color' => 'yellow' ],
(object) [ 'title' => 'title 3', 'color' => 'red' ]
);
Result:
var_dump($posts);
array(3) {
[0]=>
object(stdClass)#1 (2) {
["title"]=>
string(7) "title 1"
["color"]=>
string(5) "green"
}
[1]=>
object(stdClass)#2 (2) {
["title"]=>
string(7) "title 2"
["color"]=>
string(6) "yellow"
}
[2]=>
object(stdClass)#3 (2) {
["title"]=>
string(7) "title 3"
["color"]=>
string(3) "red"
}
}
Solution 6 - Php
Another intuitive solution could be:
class Post
{
public $title;
public $date;
}
$posts = array();
$posts[0] = new Post();
$posts[0]->title = 'post sample 1';
$posts[0]->date = '1/1/2021';
$posts[1] = new Post();
$posts[1]->title = 'post sample 2';
$posts[1]->date = '2/2/2021';
foreach ($posts as $post) {
echo 'Post Title:' . $post->title . ' Post Date:' . $post->date . "\n";
}
Solution 7 - Php
Although all the answers given are correct, in fact they do not completely answer the question which was about using the [] construct and more generally filling the array with objects.
A more relevant answer can be found in https://stackoverflow.com/questions/3707722/how-to-build-arrays-of-objects-in-php-without-specifying-an-index-number which clearly shows how to solve the problem.