php - list friend from sql -

i trying echo friends table not echoed. put following sql:

$sql="select user2 , user1 friends        user1 = '$log_username' or user2 = '$log_username'        , accepted ='1' , isblocked='1' ";  $query = mysqli_query($db_conx, $sql);  

and table:

and $log_username = mtest, highlight rows corresponding result didn't get. there know there logic error. please me out this.

select user2 , user1 friends; fetch friends user1,user2 column , after (user1 = '$log_username' or user2 = '$log_username') condition , fetch user match atleast 1 column last condition filter accept 1 , friend blocked 0.

$sql="select user2 , user1 friends        (user1 = '$log_username' or user2 = '$log_username')        , (accepted ='1' , isblocked='0') ";  $query = mysqli_query($db_conx, $sql);