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[RESOLVED] Object passing question

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Jan 25.2008

Okay so i’m reading a bunch of articles about trying to pass objects from page to page, which in some cases would help me out a great deal. However, the issue i’m having is that it’s not working for me.

I have created three simple classes to try to get something working so i know the steps to follow however it’s not working.

Is it even possible to do?

Here is the sample code i’m working with :
PHP Class:

[CODE]
<?php
Class testClass{
var $mName;
function testClass(){
}
function getName(){
return $mName;
}
function setName($inName){
$mName = $name;
}
}
[/CODE]

starting HTML page:

[CODE]
<?php
include(‘./testClass.php’);
session_start();
?>
<html>
<head></head>
<body>
<?php
$myNmae = “testing123″;
$myClass = new testClass();
$myClass->setName($myName);
$_SESSION[‘testClass’] = $myClass;
?>
<p><a href=”to.html”>go to the other page</a></p>
</body>
</html>
[/CODE]

The Final page:

[CODE]
<?php
include(‘./testClass.php’);
session_start();
?>
<html>
<head></head>
<body>
<p>
<?php
$testing = $_SESSION[‘testClass’];
$name = $testing->getName();
echo ‘<br /> The name is: ‘. $name . ‘<br />’;
?></p>
</body>
</html>
[/CODE]

The outcome from the to.html page is just “The name is: ” and $name appears to be empty. But no errors are thrown or anything.

Help?

to post a comment
PHP

11 Comments(s) ↴

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@NogDogJan 25.2008 — Use serialize() and unserialize():
[code=php]
$_SESSION['testClass'] = serialize($myClass);

// . . .

$testing = unserialize($_SESSION['testClass']);
[/code]
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@sbriouxauthorJan 25.2008 — Just tried it.. doesn't seem to work either....
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@jasonahouleJan 25.2008 — You have a typo - $myNmae = "testing123";

Be careful storing objects in sessions. You may see unexpected results. If a value is changed elsewhere it will not be reflected in your instantiated object.
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@sbriouxauthorJan 25.2008 — Sorry I had to type that out by hand instead of copy and pasting from putty. However that error doesn't exist in my code.

But I still does not work.
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@jasonahouleJan 25.2008 — The getName function should return $this->mName. Same goes for the set function $this->mName = $inName
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@jasonahouleJan 25.2008 — Here, try using this to compare and debug.
[code=php]
<?php
session_start();

class TestClass {
private $mName;

public function __construct($name){
$this->mName = $name;
}
public function getName() {
return $this->mName;
}
public function setName($name) {
$this->mName = $name;
}
}

if(!empty($_SESSION['test'])) {
$test = unserialize($_SESSION['test']);
echo "The session value is: " . $test->getName();
}

$test = new TestClass("Jason");
$_SESSION['test'] = serialize($test);
?>
[/code]
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@sbriouxauthorJan 28.2008 — Adding the $this->mName worked!!! Thanks alot!!!
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@jasonahouleJan 28.2008 — Glad to hear it, but do you understand why it worked?
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@sbriouxauthorJan 28.2008 — Basically came down to a scope issue right? I'm still fairly new to PHP.
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@jasonahouleJan 29.2008 — In a way, yes. The $mName variable is a property of the object. So yes, the $mName variable inside the get and set functions was not the same variable as the property of the object. These functions have no knowledge of the object property unless you specifically tell it so. So if you were to access that property directly you would use $myObject->mName.

Hmm, I hope that doesn't confuse you. I don't think I explained that very well. It is the basics of object oriented programming though.
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@sbriouxauthorJan 29.2008 — Makes sense to me. I realized afterwards like I said it was basically a scope issue and i was trying to use a variable that was local to the function but not the object itself.
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