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Jul 25th, 2007

Object Oriented PHP Question

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I've just started looking at OO PHP and was wondering how you would access an object in a script other than the one that instantiated it.

For example:

PHP Syntax (Toggle Plain Text)
<?php // file: animal.php
 
Class Animal
{
      $name;
      $noise;
 
      function _construct($nm, $no)
      {
            $this->name = $nm;
            $this->noise = $no;
      }
 
      function noise()
      {
            return $this->$noise;
      }
}
 
$dog = new Animal("dog", "Woof!");
 
?>
<?php // file: animal.php

Class Animal
{
      $name;
      $noise;

      function _construct($nm, $no)
      {
            $this->name = $nm;
            $this->noise = $no;
      }
      
      function noise()
      {
            return $this->$noise;
      }
}

$dog = new Animal("dog", "Woof!");

?>

How could i access the $dog object in a different script?

Any help would be much appreciated.

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Cerberus

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Jul 25th, 2007

Re: Object Oriented PHP Question

You wouldnt really create the object of Animal in its own class unless you really need to.

After creating the class and all its methods.

You just need to do.

PHP Syntax (Toggle Plain Text)
include_once("dir/clsAnimal.php");
 
$dog = new Animal("dog", "Woof!");
$noise = $dog->noise();
echo $noise;
 
NOTE: Within your class your instance variables '$noise' and '$name' you should declare them specifying the type of variable it is.
 
Being 'public' 'protected' or 'private'.
eg:
public $noise; 
public $name;
include_once("dir/clsAnimal.php");

$dog = new Animal("dog", "Woof!");
$noise = $dog->noise();
echo $noise;

NOTE: Within your class your instance variables '$noise' and '$name' you should declare them specifying the type of variable it is.

Being 'public' 'protected' or 'private'.
eg:
public $noise; 
public $name;

code is fine, but you generally include the class then create an object out of it.

Cheers.

dr4g

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Jul 25th, 2007

Re: Object Oriented PHP Question

Thanks for your reply.

I just wrote that example quickly. I fully appreciate most OO concepts like access control etc. What i really want to do is load a class with data from a database and be able to access it throughout an entire web application. I was just wondering if this was possible some how.

Cerberus

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Jul 25th, 2007

Re: Object Oriented PHP Question

Do you want to create the class using DB information?

Or get DB information when creating the class ?

Just clarifying before i answer your question

dr4g

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Jul 25th, 2007

Re: Object Oriented PHP Question

Basically when a user successfully logs in i want to instantiate an object and load it with the users details. The class would have functions to manipulate the date etc. I would like to be able to access this object through all scripts on the site if its possible.

Thanks.

Cerberus

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Jul 25th, 2007

Re: Object Oriented PHP Question

What you want to do, is create a global space for your site,
and depending on which action your performing, include the appropriate class and content pages.

What i do is make a module (eg: for handling all User operations).
which then includes the content.

I have attached an image to help explain how to do things in OOP.
It's merley an example there are 101 ways to skin a cat. just your preference really.

Cheers.

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dr4g

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Jul 25th, 2007

Re: Object Oriented PHP Question

Thanks i will have to read up on that.

Cerberus

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Jul 25th, 2007

Re: Object Oriented PHP Question

You can store your object in $_SESSION[] if you need to maintain it throughout many page views. Keep in mind you can't have session_autostart turned on if you wish to include user objects in the SESSION global array, since it needs to load the class definition before the session is started.
See here for more info:
http://www.php.net/manual/en/ref.session.php

Ezzaral

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Posting Genius

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Jul 26th, 2007

Re: Object Oriented PHP Question

Thanks, i tried this but had problems accessing the object. But i'll try again. I assume that session auto start is a PHP configuration to stop you have to type session_start.

Cerberus

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Jul 26th, 2007

Re: Object Oriented PHP Question

Ok, i can't seem to do it. Would you mind telling me what i'm doing wrong. I get an error in the third script.

PHP Syntax (Toggle Plain Text)
<?php    //animal.inc
 
class Animal
{
    private $noise;
 
    function __construct($param)
    {
        $this->noise = $param;
    }
 
    function makeNoise()
    {
        return $this->noise;
    }
}
 
?>
<?php    //animal.inc

class Animal
{
    private $noise;
    
    function __construct($param)
    {
        $this->noise = $param;
    }
    
    function makeNoise()
    {
        return $this->noise;
    }
}

?>

PHP Syntax (Toggle Plain Text)
<?php    //instantiate.php
 
    require('animal.inc');
 
    session_start();
 
    $dog = new Animal("Woof!");
 
    $_SESSION[obj] = $dog;
 
?>
<?php    //instantiate.php

    require('animal.inc');
    
    session_start();

    $dog = new Animal("Woof!");
    
    $_SESSION[obj] = $dog;
   
?>

PHP Syntax (Toggle Plain Text)
<?php    //call.php
 
    require('animal.inc');
 
    session_start();
 
    echo " a dog goes woof";
 
    $dog = $_SESSION[obj];
 
    //error on next line
    //$noise = $dog->makeNoise();
?>
<?php    //call.php

    require('animal.inc');
    
    session_start();

    echo " a dog goes woof";
    
    $dog = $_SESSION[obj];
    
    //error on next line
    //$noise = $dog->makeNoise();
?>

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