PHP - ayuda soy Nueva en esto

<?php

$conn = oci_connect("###", "###","#######");

if (!$conn) {

  $m = oci_error();

  echo $m['message'];

  exit;

} else {

  echo "";

}

$stid = oci_parse($conn,"SELECT buyer_code,buyer_nm FROM trimbuyr WHERE use_yn='Y'

order by 2" );

oci_execute($stid);

   echo "<select name='nombre'>";

while ($row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS)) {

    echo "<tr>";

  foreach  ($row as $elemento) {

     echo "<option>" . ($elemento !== null ? htmlentities($elemento, ENT_QUOTES) :'') . "</option>";

    }

    echo "</tr>";

}

echo "</select";

 // close the oracle connections

 oci_free_statement($stid);

 oci_close($conn);

?>

echo "</select"; te falta el >

select ..... WHERE use_yn='Y'

select ..... WHERE use_yn='Y' AND user_id = $usuario_actual

$usuario_actual = $_SESSION['user'];