#! code

Question

The following code was executed.

<?php
class MyClass {
  private $foo = "bar";
}

$myObject = new MyClass();
echo $myObject;

Which produced the following error.

Catchable fatal error: Object of class MyClass could not be converted to string in test.php on line 7

Call Stack:
    0.0011     323736   1. {main}() /test.php:0

How can the code be simply changed to prevent this error and produce some form of result?

Overloading in PHP describes the way in which properties and methods of an object can be dynamically created or accessed without having to define them first. Traditionally, the word overloading in programming is used to describe accessing object methods with the same name but with different parameters. It is not possible to do this in PHP as it will complain about methods having the same name, so the term describes calling a method or accessing a property that hasn't previously been set or is out of scope. In object orientated terms this means that the method or property is private.

The instanceof operator is used in PHP to find out if an object is an instantiated instance of a class. It's quite easy to use and works in the same sort of way as other operators. This can be useful to controlling objects in large applications as you can make sure that a parameter is a particular instance of an object before using it. Lets create a couple of classes as examples.

When validating a password it is easy enough to make sure that the password is of a certain length, but what happens if you want to make sure that the password has at least one number, or contains a mixture of upper and lowercase letters? I recently had to validate a password like this and so I created a password validation class that allows easy validation of a password string to a set of given parameters, but also allow these parameters to be changed when needed.

What? Don't worry, I can't say it either. It is officially called the Scope Resolution Operator (but also just a double colon) and is used to reference static properties and functions of a class. It is also used to reference overridden functions of classes.

To reference a constant of a class you do something similar to the following.

After setting up your session management in your application using one of the Zend_Auth adapters you might want to allow users to stay logged in. What you need to do is set some configuration options in the Zend_Session object. Zend_Auth uses Zend_Session as an object orientated way of manipulating the $_SESSION variable. Any changes you make to the Zend_Session object will affect the Zend_Auth object, as long as you set these options before the sessions are started.