Sessions - 1 works, 1 doesnt.

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I am trying to set sessions for the 8way media library in order to be able to sort the videos by both categories and tagcache. I have provided the code below, which works great when sorting divisions. However, when sorting by Leagues the session is not setting properly

PHP Code:

// determine if user filtered by solely the league 
else if (isset($_REQUEST['league'])) { 

    //update the session 
    $media_league = $_REQUEST['league']; 
    $vbulletin->session->set('media_league', $media_league); 

    //set the filter 
    $query_filter = "WHERE media_category.catOrder = '" . $vbulletin->session->var['media_league'] . "'"; 
} 

// determine if user filtered by solely the division 
else if (isset($_REQUEST['division'])) { 

    //update the session 
    $media_division = $_REQUEST['division']; 
    $vbulletin->session->set('media_division' , $media_division); 
     

    // set the filter 
    $query_filter = "WHERE media_category.catOrder != '0' AND media.tagcache LIKE '%" . $vbulletin->session->var['media_division'] . "%'"; 
} 

//otherwise no filter 
else { 
    $query_filter = "WHERE media_category.catOrder != '0'"; 
} 


To further explain my situation I have provided the problematic code below.

PHP Code:

//THIS WORKS 
    $media_league = $_REQUEST['league']; 

//THIS DOESNT 
    $vbulletin->session->set('media_league', $media_league); 


Now. The only difference between the two is that media_division is passed as either "toronto, calgary, montreal, or vancouver" while media_league is passed as either "1, 2, 3, 4, 5, 6, or 7"

I tried both (int)$media_league and (string)$media_league with no success. Any ideas? Thank you!