Passing a variable from one page to another in php

I want to dynamically populate data in Facebook open tags. For this, I need to pass a variable from my controller file to a file which is outside the CI model. How to do this?

public function index()

{ 



   $data['clients'] = $this->qua_model->list_clients();

   $data['clientst'] = $this->qua_model->list_clientst();

   $id = $this->uri->segment(3);

  //GET RECORD BY ID
   $data['result']=$this->qua_model->get_record_by_id($id);
  // print_r($data['result']);


  $data['url']=  urlencode(base_url().'intermediate.php?data=$result');


  // print_r($data['url']);
  // return;


    //echo $data['url'];
    //exit();


   //$data['url'] = base_url().'Testimonial';
   $this->load->view("header",$data);   

   $this->load->view("testimonial",$data);

   $this->load->view("footer"); 

}

The above code is the index function of my controller. I want to pass the variable $result to intermediate.php page.

Below is the intermediate.php page.

    <!DOCTYPE html>
<html>


<head>
<!--<meta property="fb:app_id" content="535219850163370" />
<meta property="og:site_name" content="meta site name"/>
-->
<meta property="og:url" content="http://www.quanutrition.com/Dotcom/new/"/>
<meta property="og:type" content="website"/>
<meta property="og:title" content="title"/>
<meta property="og:image" content="http://quanutrition.com/Dotcom/new//admin/assets/uploads/clients_image/shikhar-dhawan-759.jpg"/>
<meta property="og:description" content="My description"/>

    <script type="text/javascript">
         <!--
            function Redirect() {
               window.location="http://www.quanutrition.com/Dotcom/new/"; 
            }
         //-->
    </script>

</head>

;
<body onload="Redirect()" >



</body>
</html>

Below is the view page where I am setting the session. $clients is the variable that contains the array.

<?php
session_start();
$_SESSION['clients']=$clients;
print_r ($_SESSION);
exit();
?>

Now in the other page I am doing this.

<?php
  session_start();  
  print_r ($_SESSION);
  $var = $_SESSION['clients'];
  echo $var;
  exit();

?>

It is throwing this error - Undefined index: clients. What am I doing wrong?

This is how a single data in my array in $clients look like

Array ( [clients] => Array ( [0] => stdClass Object ( [client_id] => 1 [name] => Shikhar Dhawan [image] => shikhar-dhawan-759.jpg [video] => [content1] => "Nutrition plays a key role in my recovery and performance. Using Sports Gene testing and advance nutritional blood biochemistry helps me. Eating with a plan gets more scientific and result oriented this way."

Passing data using $_SESSION in PHP

Sessions follow a simple workflow. When a session is started, PHP will either retrieve an existing session using the ID passed (usually from a session cookie) or if no session is passed it will create a new session. PHP will populate the $_SESSION superglobal with any session data after the session has started.

See here: http://php.net/manual/en/session.examples.basic.php

Every time you want to store or retrieve data from your session you need to open the session. session_start();

So you need to use this in your controler.php:

<?php
session_start();
...

at the very top. This will start your session and now you can simply store your variables/data in the session you just started. To do so:

$_SESSION['var_name'] = "value";

$_SESSION['foo'] = bar;

On your next page you start all over again with:

<?php
session_start();
...

at the very top. An then you simply call the variable:

$new_page_var = $_SESSION['foo']; // contains now 'bar'

If you don't need the variable anymore you can follow this by:

unset($_SESSION['foo']);

and the variable will be deleted.

Once you're done and no session is needed anymore you also can detroy the session using: session_destroy(); - This will delete the session and all the stored data in there!

Hope this helps, cheers :)

With your example here:

<?php
session_start();
$_SESSION['clients']=$clients;
print_r ($_SESSION);
exit();
?>

You're missing $clients variable! Look here:

<?php
session_start();
$clients=array("foo", "bar");
$_SESSION['clients']=$clients;
print_r ($_SESSION);
exit();
?>

Cheers