Description:
------------
My configuration to connect to Oracle 9i is correct. I am able to connect to Oracle 9i using SQLPLus and TOAD. But using PHP I am unable to connect to Oracle this error appears "ORA-12154: TNS:could not resolve the connect identifier specified".

Reproduce code:
---------------
<?php

  $conexion = oci_pconnect('TIENDAS','tiendas','DAVID');//('hr', 'hr', 'orcl');
  if (!$conexion) {
    $e = oci_error();
    echo "Error al Conectarse";
    print htmlentities($e['message']);
    exit;
  }

  $consulta = 'SELECT * FROM promotoras_tda';

  $id_sentencia = oci_parse($conexion, $consulta);
  if (!$id_sentencia) {
    $e = oci_error($conexion);
    echo "Error al Parsear";
    print htmlentities($e['message']);
    exit;
  }

  $r = oci_execute($id_sentencia, OCI_DEFAULT);
  if (!$r) {
    $e = oci_error($id_sentencia);
    echo "Error al Ejecutar la Conuslta";
    echo htmlentities($e['message']);
    exit;
  }

  print '<table border="1">';
  while ($fila = oci_fetch_array($id_sentencia, OCI_RETURN_NULLS)) {
    print '<tr>';
       foreach ($fila as $item) {
         print '<td>'.($item?htmlentities($item):'&nbsp;').'</td>';
       }
       print '</tr>';
  }
  print '</table>';

  oci_close($conexion);
?> 

Expected result:
----------------
connected!

Actual result:
--------------
ORA-12154: TNS:could not resolve the connect identifier specified