PHP OOP - Sending simple message and insert it to database - php

Question

I wrote a PHP script for myself which gets data from a form and simply send it to a database. It looks like this:
class Users {
/* Deklarovanie premennych */
public $name = null;
public $email = null;
public $phone = null;
public $message = null;
public function __construct( $array = array() ) {
if( isset( $data['name'] ) ) $this->name = stripslashes( strip_tags( $data['name'] ) );
if( isset( $data['email'] ) ) $this->email = stripslashes( strip_tags( $data['email'] ) );
if( isset( $data['phone'] ) ) $this->phone = stripslashes( strip_tags( $data['phone'] ) );
if( isset( $data['message'] ) ) $this->message = stripslashes( strip_tags( $data['message'] ) );
/* využitá funkcia stripslashes pre odstránenie "\" ktoré mohol vložiť užívateľ do formulara */
}
public function storeFormValues( $formvalues ) {
$this->__construct( $formvalues );
/*uložíme hodnoty zíaskne z $_POST*/
}
public function message() {
$correct = false;
try {
$db_con = new PDO( DB_HOST, DB_USER, DB_PASS );
$db_con->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$sql = "INSERT INTO user(name, email, phone, message) VALUES(:name, :email, :phone, :message)";
$stmt = $db_con->prepare( $sql );
$stmt->bindValue( "name", $this->name, PDO::PARAM_STR );
$stmt->bindValue( "email", $this->email, PDO::PARAM_STR );
$stmt->bindValue( "phone", $this->phone, PDO::PARAM_STR );
$stmt->bindValue( "message", $this->message, PDO::PARAM_STR );
$stmt->execute();
return "Správa bola úspešne odoslaná!! <br/> <a href='index.php'>pozrieť správy!</a>";
}catch( PDOException $exce ) {
return $exce->getMessage();
}
}
}
?>
In my eyes the code looks fine and understandable. It doesn't throw any errors but the problem is that it doesn't insert anything into the database. I am not sure where the problem can be.
And I nearly forgot this is my index part:
<?php
} else {
$Users = new Users;
$Users->storeFormValues( $_POST );
if( $Users->message() ) {
echo "Sprava bola úspešne odoslana";
} else {
echo "Sprava nebola odoslana";
}
}
?>