<?php

$host = '127.0.0.1';
$db   = 'test';
$user = 'root';
$pass = 'blah';
$charset = 'utf8';

$dsn = "mysql:host=$host;dbname=$db;charset=$charset"; // data source name
$dbh = new PDO("$dsn", $user, $pass)

function create_db() {
    try {
        $dbh->exec("CREATE DATABASE `$db`;") or die(print_r($dbh->errorInfo(), true));
    } catch (PDOException $e) {
        die("DB ERROR: " . $e->getMessage());
    }
    return 0;
}

create_db();

?>