Couple Of Questions, regarding objects/sessions...

[Grofit]

Hello again,

ok i may as well just dive in... heres an example of my problem.

//Class.php
class PHPClass
{
  var $String;
  var $Number;
}

//Page1.html
requires(Class.php);
$NewObject = new PHPClass;

// post vars from a form on the page with 2 text boxes
$NewObject->String = $_POST["InputtedText"];
$NewObject->Number = $_POST["inputtedNumber"];

$_POST["PassingObject"] = $NewObject;

// Link to Page2.html

//Page2.html
requires(Class.php)
$PassedObject = $_POST["PassingObject"];

echo $PassedObject->String, "<br><br>";
echo $PassedObject->Number;

Well theres the basics of my first situation with a problem, if i do that it doesnt seem to remember what kinda object it is when passed over, and with mine i have functions that it cant call because of this, ive tried type casting it as the object but doesnt like it.. anyway can anyone shed any light on if you can pass custom objects between pages through sessions or posts.

Now onto my 2nd question...

Can i use form objects such as text boxes without forms, i want to use text boxes but i want to pass the values over through sessions so i can keep the values for multiple pages opposed to the only one that the post action passes to. For one im not sure how to get the value out of a text box outside of a form.. would it be like this:

//Page1.html
session_start();

//Text box called "TText"

$RandomString = $TText;

echo $RandomString;

the problem i see with the above is that we havent acctually told the textbox (TText) that its a variable, usually the form does that with $_POST["TText"] anyway is the above possible in any way.. im sure it is..lol anyway this links onto my next problem with this system.

If im not using posts, then how do i specify to only send the value over when its got an inputted variable. I mean when you use posts then as soon as you press submit as far as i know it grabs the vars inputted and throws them over. If we are using this outside of the post system such as with sessions then to my knowledge there isnt a way to tell it to grab the variables on a link pressed or a button...

Anyway i think im rambling and just confusing people now..lol any help would be great, i can talk more about the 2nd problem later on if people know what im on about... haha thx again PHP community 🙂

[Kudose]

http://www.cnetbbs.net/modules.php?name=AvantGo&file=print&sid=7

One warning, though -- if you store an object in a session var, the object's class must be defined BEFORE you call session_start() so that PHP knows what the object's name and structure are.

[devinemke]

the following i think will address both of your questions:

objects, just like any other PHP type (strings, integers, arrays, etc...) can be passed from page to page via essentially 3 ways:
1. GET vars on URL query string
2. POST vars (often using hidden form fields)
3. sessions

for many types and situations method #1 will suffice (like passing strings for a naviagtion system) but for objects, sessions are the way to go. consider this (based on your own class definition):

page1.php

<?php
include('Class.php');
session_start(); 

$NewObject = new PHPClass; 
$NewObject->String = 'this is a string';  

$NewObject->Number = 666; 
$_SESSION['NewObject'] = $NewObject; 
echo '<a href="page2.php">go to page 2</a>';
?>

and then on page2.php

<?php
include('Class.php');
session_start(); 

echo $_SESSION['NewObject']->String; // outputs "this is a string" 
echo '<br>'; 
echo $_SESSION['NewObject']->Number; // ouputs 666
?>

[Grofit]

ah brillant thanks i will get on with trying that out.. i read somewhere that:

session_start();

had to be always at the top of a page.. lol oh well your the pro, thanks for the help again 🙂

so does anyone know how to get the value of a textbox without using forms?

[devinemke]

Originally posted by Grofit
so does anyone know how to get the value of a textbox without using forms?

how/why would have a textbox without a form?

[Kudose]

As devinemke eluded to, you can't.

[Kudose]

session_start() doesn't have to be at the top.

But it HAS to be before headers or information is sent to the browser.

[Grofit]

Originally posted by devinemke
the following i think will address both of your questions:

objects, just like any other PHP type (strings, integers, arrays, etc...) can be passed from page to page via essentially 3 ways:
1. GET vars on URL query string
2. POST vars (often using hidden form fields)
3. sessions

for many types and situations method #1 will suffice (like passing strings for a naviagtion system) but for objects, sessions are the way to go. consider this (based on your own class definition):

page1.php

<?php
include('Class.php');
session_start(); 

$NewObject = new PHPClass; 
$NewObject->String = 'this is a string';  

$NewObject->Number = 666; 
$_SESSION['NewObject'] = $NewObject; 
echo '<a href="page2.php">go to page 2</a>';
?>

and then on page2.php

<?php
include('Class.php');
session_start(); 

echo $_SESSION['NewObject']->String; // outputs "this is a string" 
echo '<br>'; 
echo $_SESSION['NewObject']->Number; // ouputs 666
?>

[/B]

🙁 still wont work get the:

Fatal error: Call to a member function on a non-object in c:\phpdev\private\charcreation2.php on line 13

//charcreation2.php (line 9-18)
include("Character.php");
@session_start(); 

// Set The Vars
$_SESSION["Character"]->Set_Name($_POST["TName"]);
$_SESSION["Character"]->Set_Race($_POST["LRace"]);
$_SESSION["Character"]->Set_Class($_POST["LClass"]);

// Get Random Stats
$_SESSION["Character"]->Calculate_Stats();

the page before this which calls it with the form contains this code:

//charcreation1.php
include("Character.php");
session_start();

$_SESSION["Character"] = new Character;

Anything wrong with that?

[devinemke]

which page is the form handler, charcreation1.php or charcreation2.php? i think you have your logic mixed up here. the POST vars will be available on the page that is the form handler. also what does Character.php look like.

[Grofit]

this is how it runs...

Main Menu, HTML File (Page 1)

this just contains a load of links to char creation, editing etc.

CharCreation1, PHP File (Page 2)

this contains a form that just takes in 3 variables (1 text, 2 list)
this could just be a html file if i wanted, but i wanted to do some checking later on, so it will remember char details.

CharCreation2, PHP File (Page 3)

this just contains a recap of what was in the 2nd page and then uses the values given there to randomly create stats, these stats are then either re-rolled or saved.

CharCreation3, PHP File (Page 4)

this recaps everything and confirms character creation, this will also input details into a DB when it all works.

so the basics go:

Main_Menu.html -> CharCreation1.php -> CharCreation2.php -> Charcreation 3.php

(HTML -> Form -> PHP -> PHP + DB connectivity)

hope that makes sense...

oh and Character.php is just a file that contains aload of class info, such as vars/functions that are used on the other pages. Im just used to C++ so i like to keep the main classes in other files so there isnt code all over the place...

[Grofit]

Ah.. re-reading what you put..

"i think you have your logic mixed up here. the POST vars will be available on the page that is the form handler"

So CharCreation1.php being the actual form means that the $_POST[] vars should only be available on that page, so on CharCreation1.php i could put the code:

$_SESSION["Character"]->Set_Name($_POST["TextBoxName"]);

and it will automatically update the $_POST[] vars on the form page?

the way i thought of it was..one page had the form, then when you pressed submit it grabbed all the variables threw them all into $_POST[] things and then the page the form calls can make use of those variables. I thought of it this way because i didnt know how it would know when the variables are ready..

this is hard to explain as my minds stupid.. but imagine you have a form with a text box called Name. You want the variable contained withing Name but how do you know when the user has put in the finished value. i mean i could put in "Grofit" then 5 seconds later change it to "PHP" so i thought that the submit button was the point of no return, but the submit button loads another page, so the only point i could see of you getting the actual values you wanted in the $_POST[] vars was as soon as Submit was pressed, meaning the next page would have the values you want...

That make sense?...

[Grofit]

ok ive messed around lots still with no result 🙁

i keep getting the following warning:

Cannot send session cookie (headers already sent by Character.php)

Cannot send session cache limiter (same as above i think)

i get these warning on all pages with session_start() included, be it at the top of the page above everything else, or below stuff...

include(Character.php);
session_start();

thats in the top of every PHP file used except Character.php as its layout is like this:

// Character.php
//comments

//class definition
{
// Class Vars

// Class Functions
};

there is no HTML in there and no session_start() function call.. anyone have any ideas? and also while we are here, can you put objects within classes... like:

class engine
{
var $Speed;
}

class car
{
 $CarEngine = new engine;

 function SetSpeed($MaxSpeed) {$this->CarEngine->Speed = $MaxSpeed};
}

anyway the last question is not really troubling me atm, i just had difficulty when i attempted it before.. so can anyone help me with the 1st issue? thanks if you can 🙂

[devinemke]

you cannot send ANYTHING to the browser before calling session_start() not even whitespace. i suspect you have some whitespace in Character.php (the error will tell you which line).

[Grofit]

will check now.. thanks for fast reply 🙂

checked done... works! BUT!!

lol there is always a but..

back up what you said about forms and how the page with the form should be the page where you get the $_POST[] vars... could you just give me a quick summary of how this works.. as resources i look at so far seem to have conflicting info.. and so far all your words have been full of wisdom 🙂

if your too busy its ok.. but can anyone spare me a few mins and explain to me the basic scopes of $_POST[] / forms and things.. as i think im confused...

thanks again PHP community 🙂