Sybase SQL Anywhere - Conectar Sybase con PHP

// Configure connection parameters

  $db_host        = "server.mynetwork";

  $db_server_name = "Dev_Server";

  $db_name        = "Dev_Data";

  $db_file        = 'c:\dbstorage\dev.db';

  $db_conn_name   = "php_script";

  $db_user        = "dbuser";

  $db_pass        = "dbpass";

//================================================================

  $connect_string = "Driver={Adaptive Server Anywhere 8.0};".

                    "CommLinks=tcpip(Host=$db_host);".

                    "ServerName=$db_server_name;".

                    "DatabaseName=$db_name;".

                    "DatabaseFile=$db_file;".

                    "ConnectionName=$db_conn_name;".

                    "uid=$db_user;pwd=$db_pass";

  // Connect to DB

  $conn = odbc_connect($connect_string,'','');

<?

$conn=odbc_connect('MiODBC','dba','sql');

if (!$conn)

  {exit("Connection Failed: " . $conn);}

$sql="SELECT DBA.ESTUDIANTE.CEDULA_ESTUDIANTE AS CEDULA,

         DBA.ESTUDIANTE.nombre_apellido AS NOMBRE

    FROM DBA.MATERIA_PREINSCRIPCION,

         DBA.ESTUDIANTE  

   WHERE ( DBA.MATERIA_PREINSCRIPCION.CEDULA_ESTUDIANTE = DBA.ESTUDIANTE.CEDULA_ESTUDIANTE ) and

         (  DBA.MATERIA_PREINSCRIPCION.CODI_MATERIA = $MAT ) 

           ORDER BY CEDULA ASC;";

$rs=odbc_exec($conn,$sql);

if (!$rs)

  {exit("Error in SQL");}

echo "<table>MATERIA: $MAT<tr>";

echo "<th>Cédula</th>";

echo "<th>Nombre</th></tr>";

$per_ant='';

while (odbc_fetch_row($rs))

  {

  $ced=odbc_result($rs,"CEDULA");

  $nom=odbc_result($rs,"NOMBRE");

  echo "<tr><td align=\"center\">$ced</td>";

  echo "<td align=\"center\">$nom</td></tr>";

  }

odbc_close($conn);

?>

</table>