$title = "new post";
$text = "new text";

$query = 'insert into posts (title, text) values ("$title" ,"$text")';
//запрос будет иметь вид такой
//insert into posts (title, text) values ("$title" ,"$text")

$query = "insert into posts (title, text) values ("$title" ,"$text")";
//запрос будет иметь вид такой
//insert into posts (title, text) values ("new post" ,"new text")

<?php
$dataSource = 'mysql:dbname=server;host=localhost';
$user = 'world';
$password = '';
$db = new PDO($dataSource, $user, $password);
$db->exec("SET NAMES utf8");
$db->exec("SELECT id, title, text, date FROM wNews ORDER BY bid ASC");
$db->null;
?>