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array of multiple employees or an array of 1 employee information

Posted on 2014-01-16
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Last Modified: 2014-01-25
from php oop tuturial
http://www.larryullman.com/books/php-advanced-and-object-oriented-programming/

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">
<head>
    <meta charset="utf-8">
    <title>Type Hinting</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
<?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:
$hr->addEmployee($e1);
$hr->addEmployee($e2);

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

?>
</body>
</html>

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Question by:rgb192
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8 Comments
 
LVL 20

Assisted Solution

by:Mark Brady
Mark Brady earned 167 total points
Comment Utility
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.
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LVL 34

Assisted Solution

by:gr8gonzo
gr8gonzo earned 333 total points
Comment Utility
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.
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LVL 20

Expert Comment

by:Mark Brady
Comment Utility
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.
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Author Comment

by:rgb192
Comment Utility
My question is how can a non static property store values of multiple objects
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LVL 34

Accepted Solution

by:
gr8gonzo earned 333 total points
Comment Utility
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...
0
 

Author Closing Comment

by:rgb192
Comment Utility
thanks.  I will open a question about example of class that can hold an array
0
 

Author Comment

by:rgb192
Comment Utility
I have a followup question about example of class that can hold an array

http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_28342292.html
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Author Comment

by:rgb192
Comment Utility
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_28342292.html

I have a followup about

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

able to hold values from multiple instances.
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