I want to transfer following session variables in to associative array. site id is used to each site deferment from each other.

PHP Code:
$_SESSION['username_'.$Site_ID]                     = $username;    
$_SESSION['password_'.$Site_ID]                     = $password;

$_SESSION['contact_job_title_'.$Site_ID]                     = $contact_job_title;    
$_SESSION['contact_given_name_'.$Site_ID]             = $contact_given_name;    
$_SESSION['contact_family_name_'.$Site_ID]            = $contact_family_name;            
$_SESSION['contact_address_1_'.$Site_ID]             = $contact_address_1;    
$_SESSION['contact_address_2_'.$Site_ID]             = $contact_address_2;    
$_SESSION['contact_postcode_'.$Site_ID]             = $contact_postcode;            
$_SESSION['contact_city_'.$Site_ID]                    = $contact_city;    
$_SESSION['contact_county_'.$Site_ID]                = $contact_county;    
$_SESSION['contact_country_id_'.$Site_ID]            = $contact_country_id;    
$_SESSION['contact_email_'.$Site_ID]                = $contact_email;    
$_SESSION['contact_telephone_'.$Site_ID]            = $contact_telephone;    
$_SESSION['contact_mobile_telephone_'.$Site_ID]        = $contact_mobile_telephone;
$_SESSION['sams_puid_'.$Site_ID]                    = $sams_puid
Thanks in advance from a new php learner