php - Check if usergroup exists -

i have 2 variables both hold comma separated lists. 1 permissions variable , other usergroup list of person wanting access page.

1 = user

2 = editor

3 = moderator

4 = admin

    <?php     $query = mysql_query("select * users id='{$user['id']}'");     $user = mysql_fetch_assoc($query);      $query2 = mysql_query("select * menu active='1'");     $page = mysql_fetch_assoc($query2);      echo $user['usergroup']; // 1     echo $page['usergroup']; // 2,3,4     ?> 

i need find way compare both variables check if have right usergroup access page

if $user['usergroup'] contains number $page['usergroup'] x otherwise y

thanks :)

$user = "1,3,5"; $page = "1,2,5";  //explode , trim case have spaces '1, 2,3 ,4' $u = array_map('trim', explode(",", $user)); $p = array_map('trim', explode(",", $page));  $intersect = array_intersect( $u, $p ); if ( count($intersect) ) {     //ok     print_r( $intersect );     } else {     //error } 

allowed permissions:

array (     [0] => 1     [2] => 5 )