php - include() not picking up previously defined variables -

i'm pretty sure need ol` fashion brain check. have never seen such silly issue , i'm sure missed dumb.

index.php

<? require('lib/conf.php');  /* bunch of code here */  echo get_user('username',$_session['uid']); 

lib/conf.php

<? /* bunch of secret stuff here */  $dbcon = new pdo("mysql:host=$db_host;dbname=$db_name", $db_user, $db_pass);   //////////// // // includes / requirements // //////////// include('functions/user.functions.php'); 

functions/user.functions.php

<? function get_user($dvar,$uid){     $psql = $dbcon->prepare("select :dvar ls_users uid=:uid");     $dbcon->begintransaction();     $psql->execute(array(":dvar"=>$dvar,":uid"=>$uid));     foreach($psql $row){ return $row[$dvar]; } } 

however attempting such simple thing, continue get:

undefined variable: dbcon in <b>/home/lodestar/public_html/lib/functions/user.functions.php</b> on line <b>10</b>  call member function prepare() on non-object in <b>/home/lodestar/public_html/lib/functions/user.functions.php</b> on line <b>9 

so, feel though i'm going crazy please check brain , tell me i'm missing?

notes

line number in error not reflect correct line number in example code

call global variable declare global variable in function use

function get_user($dvar,$uid){ global $dbcon; ..... }