Sharing array inside object through classes in php - php

Question

My problem is that I have an object shared through two classes that contains an array inside of it and along the script, someone will request some of the classes the value and a foreach loop will change such value and I want this change to affect every reference of the value.
class bar {
protected $obj;
function __construct(&$obj) {
$this->obj = $obj;
}
public function output() {
print_r($this->obj->value);
}
}
class foo {
protected $obj;
function __construct(&$obj) {
$this->obj = $obj;
}
public function val() {
$result = array();
foreach($this->obj->value as $it){
$result[] = $it;
}
return $result;
}
}
// Shared Object
$obj = new stdClass();
// Default value
$obj->value = array('teste', 'banana', 'maca');
// Class 1
$bar = new bar($obj);
// Class 2
$foo = new foo($obj);
// Someone requests from class 2 the values and changes it
$new = $foo->val();
$new[] = 'abc';
// Class 1 outputs the value
$bar->output(); // this will print the default value. I want this to also have 'abc' value.

Answer 1

The main problem, is that you are building a new array at foo:val, you must return the original object to be modified.
I suggest use ArrayObject, have the same behavior of array but is a object, then always is passed by reference.
<?php
class MyArrayObject extends ArrayObject {
public function replace(Array $array)
{
foreach($this->getArrayCopy() as $key => $value) {
$this->offsetUnset($key);
}
foreach ($array as $key => $value) {
$this[$key] = $value;
}
}
}
class bar {
protected $obj;
function __construct(MyArrayObject $obj) {
$this->obj = $obj;
}
public function output() {
print_r($this->obj);
}
}
class foo {
protected $obj;
function __construct(MyArrayObject $obj) {
$this->obj = $obj;
}
public function val() {
$result = array('foo', 'bar');
$this->obj->replace($result);
return $this->obj;
}
}
// Shared Object
$obj = new MyArrayObject(array('teste', 'banana', 'maca'));
// Class 1
$bar = new bar($obj);
// Class 2
$foo = new foo($obj);
// Someone requests from class 2 the values and changes it
$new = $foo->val();
$new[] = 'abc';
// Class 1 outputs the value
$bar->output(); // this will print the default value. I want this to also
var_dump($obj);