Database is not connecting and i am getting errors

studentdb.html

STUDENT APPLICATION FORM

FIRST NAME	(max 10 characters)
LAST NAME	(max 10 characters)
GENDER	FEMALE MALE
DATE OF BIRTH	(In mm/dd/yyyy)
EMAIL ID
MOBILE NUMBER	(10 digit number)
SSLC PERCENTAGE	(In %)
10th PASSED YEAR
PUC II PERCENTAGE	(In %)
12th PASSED YEAR
COURSE APPLIED FOR
APPLIED FOR SCHOLORSHIP	YES NO
ADDRESS
CITY
PIN CODE
STATE
COUNTRY

studentdb.php

ini_set('display_errors',1);

$FName=$_POST['FName'];
$LName=$_POST['LName'];
$Gender=$_POST['Gender'];
$DOB=$_POST['DOB'];
$Email=$_POST['Email'];
$contact_no=$_POST['contact_no'];
$SSLC=$_POST['SSLC'];
$SSLCP=$_POST['SSLCP'];
$PUC=$_POST['PUC'];
$PUCP=$_POST['PUCP'];
$Course=$_POST['Course'];
$Scholorship=$_POST['Scholorship'];
$Address=$_POST['Address'];
$City=$_POST['City'];
$Code=$_POST['Code'];
$State=$_POST['State'];
$Country=$_POST['Country'];

echo $_POST["FName"];
echo '
';
echo $_POST["LName"];
echo '
';
echo $_POST["Gender"];
echo '
';
echo $_POST["DOB"];
echo '
';
echo $_POST["Email"];
echo '
';
echo $_POST["contact_no"];
echo '
';
echo $_POST["SSLC"];
echo '
';
echo $_POST["SSLCP"];
echo '
';
echo $_POST["PUC"];
echo '
';
echo $_POST["PUCP"];
echo '
';
echo $_POST["Course"];
echo '
';
echo $_POST["Scholorship"];
echo '
';
echo $_POST["Address"];
echo '
';
echo $_POST["City"];
echo '
';
echo $_POST["Code"];
echo '
';
echo $_POST["State"];
echo '
';
echo $_POST["Country"];
echo '
';?>

mainpage.html

To Insert New DetailsINSERT

To Display DetailsDISPLAY

connectionEx.php

$conn_string= "host=localhost port=5432 dbname=naveenadb user=naveena password=P@ssw0rd";
$dbconn = pg_connect($conn_string);

class connectionEx extends conne
{

public $FName;
public $LName;
public $Gender;
public $DOB;
public $Email;
public $contact_no;
public $SSLC;
public $SSLCP;
public $PUC;
public $PUCP;
public $Course;
public $Scholorship;
public $Address;
public $City;
public $Code;
public $State;
public $Country;

$connectionEx->creation();
$connectionEx->insertion($FName,$LName,$Gender,$DOB,$Email,$contact_no,$SSLC,$SSLCP,$PUC,$PUCP,$Course,$Scholorship,$Address,$City,$Code,$State,$Country);
$connectionEx->selection($result);

}
?>

selection.php

Display

$conn_string= "host=localhost port=5432 dbname=naveenadb user=naveena password=P@ssw0rd";
$dbconn = pg_connect($conn_string);
include('connectionEx.php');
function selection($result)
{
return $this->$result;
}
?>

this is a small application im tryin to do.i have created a database using postgresql. the database is not connecting. and if i select on the SELECT in the mainpage.html,the selection process is not getting,im getting errors.Please resolve the problem for me.