Session problem

[parth]

HI all,

I am using class to hold my multiple data types.I assigned this (serialized) class instance to session variable.when I retrieve this information in different page for the first time everything works fine.But If I refresh the page...I end up with errors like the fallowing.

Notice: unserialize() failed at offset 0 of 101 bytes in C:\Program Files\Apache Group\Apache2\htdocs\test\getdata1.php on line 58

Fatal error: Call to a member function on a non-object in C:\Program Files\Apache Group\Apache2\htdocs\test\getdata1.php on line 60

What have I understood wrong?What am I missing?

[iovidiu]

try this:
<?
// this is the class
class my_class
{
// the constructor of class
function my_class($init_class="")
{
if ($init_class!="") $this=unserialize($init_class);
}
// section with your methods etc.
//.....
// the export function
function export_class()
{
return serialize($this);
}

}

// the script how to use:

session_start();
session_register("var_from_session");
$xx=$_SESSION["var_from_session"];
$myclass=new my_class($xx);

// your operation

// and now you have to set the session
$var_from_session=$myclass->export_class();
?>