array of multiple employees or an array of 1 employee information

Posted on 2014-01-16
Last Modified: 2014-01-25
from php oop tuturial

How can class department $this->_employees[] hold an array of employees
or is it just an array of 1 employee information

<!doctype html>
<html lang="en">
    <meta charset="utf-8">
    <title>Type Hinting</title>
    <link rel="stylesheet" href="style.css">
<?php # Script 6.8 - hinting.php
//  This page defines and uses the Department and Employee classes. 

# ***** CLASSES ***** #

/* Class Department.
 *  The class contains two attribute: name and employees[].
 *  The class contains two methods: 
 *  - __construct()
 *  - addEmployee()
class Department {
    private $_name;
    private $_employees;
    function __construct($name) {
        $this->_name = $name;
        $this->_employees = array();
    function addEmployee(Employee $e) {
        $this->_employees[] = $e;
        echo "<p>{$e->getName()} has been added to the {$this->_name} department.</p>";
} // End of Department class.

/* Class Employee.
 *  The class contains one attribute: name.
 *  The class contains two methods: 
 *  - __construct()
 *  - getName()
class Employee {
    private $_name;
    function __construct($name) {
        $this->_name = $name;
    function getName() {
        return $this->_name;
} // End of Employee class.

# ***** END OF CLASSES ***** #

// Create a department:
$hr = new Department('Human Resources');

// Create employees:
$e1 = new Employee('Jane Doe');
$e2 = new Employee('John Doe');

// Add the employees to the department:

// Delete the objects:
unset($hr, $e1, $e2);


Open in new window

Question by:rgb192
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2
  • 2
LVL 20

Assisted Solution

by:Mark Brady
Mark Brady earned 167 total points
ID: 39787473
I don't see the point in these classes. As soon as a value is set for the clases they are unset. Doesn't make any sense.

In answer to your question and the way this sample is written there will only ever be 1 employee in that array.

$e1 and $e2 are two completely different instances of the employee class and only one employee is added to each one.

This is not the way you would setup these classes at all.

$hr is a single instance of the department class.
$hr->addEmployee() takes a single argument but you should be sending in the actual employee "name" not the class instance (object) of the employee.

In any case this is a poor example of working with OOP (classes) in php.

Perhaps if you tell us what it is you would like to achieve we could give you a better example.
LVL 35

Assisted Solution

gr8gonzo earned 333 total points
ID: 39788837
1. I've read elvin66's comments a few times, but I'm not sure he and I are looking at the same code (or maybe my coffee hasn't kicked in yet).

Elvin, I think rgb192 is going through some tutorials, so the unset() is just a cleanup step for the test script. I don't see why you would send in an employee name vs. the object instance. The addEmployee method takes a single argument that HAS to be an Employee instance. This is a type hinting tutorial.

2. I don't understand the original question.

This line:
$this->_employees[] = $e;

...adds the instance of an employee to the the department's array of employees. So I'm trying to understand what your actual question is, since the code looks correct.
LVL 20

Expert Comment

by:Mark Brady
ID: 39788848
Actually gr8gonzo you are correct. It was me that hadn't had my coffee before reading this question! Thanks for the jab :)

I guess we just need to know what the end goal is.
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!


Author Comment

ID: 39789945
My question is how can a non static property store values of multiple objects
LVL 35

Accepted Solution

gr8gonzo earned 333 total points
ID: 39789958
It just does. It doesn't matter if an array is static or not. An array is an array, and it can hold multiple values or multiple objects...

Author Closing Comment

ID: 39791498
thanks.  I will open a question about example of class that can hold an array

Author Comment

ID: 39791695
I have a followup question about example of class that can hold an array

Author Comment

ID: 39809308

I have a followup about

line 28 $this->_employees[] = $e;

able to hold values from multiple instances.

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Build an array called $myWeek which will hold the array elements Today, Yesterday and then builds up the rest of the week by the name of the day going back 1 week.   (CODE) (CODE) Then you just need to pass your date to the function. If i…
Introduction This article is intended for those who are new to PHP error handling (  It addresses one of the most common problems that plague beginning PHP develop…
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…
The viewer will learn how to dynamically set the form action using jQuery.

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question