ho creato questo metodo per inserire dati tramite PDO:
Codice PHP:
<?php

class Config {

    private $pdo;

    public function __construct() {
        try {
            $this->pdo = new PDO(.........);
        } catch (PDOException $e) {
            print "Error!: " . $e->getMessage() . "
";
            die();
        }
    }

    public function insert($nome, $cognome, $data_nascita, $cel, $tel, $fax, $soc, $carica, $email1, $email2, $sito, $casa, $uff) {
        $sql = "INSERT INTO contatti (nome, cognome, data_nascita, cellulare, telefono, fax, societa, carica, email_1, email_2, sito_web, indirizzo_casa, indirizzo_uff) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?)";
        $prepare = $this->pdo->prepare($sql);
        $prepare->execute(array(
            $nome,
            $cognome,
            $data_nascita,
            $cel,
            $tel,
            $fax,
            $soc,
            $carica,
            $email1,
            $email2,
            $sito,
            $casa,
            $uff
        ));
    }

}
i dati glieli passo così:
Codice PHP:
<?php
require_once 'config.php';
$obj = new Config();
if ($_SERVER['REQUEST_METHOD'] == "POST") {
    $insert = $obj->insert(htmlentities($_POST['txtName'], ENT_QUOTES), $_POST['txtSurname'], $_POST['txtData'], $_POST['txtCell'], $_POST['txtTel'], $_POST['txtFax'], $_POST['txtSocieta'], $_POST['txtCarica'], $_POST['email1'], $_POST['email2'], $_POST['sito'], $_POST['indirizzoCasa'], $_POST['indirizzoUff']);
    if ($insert) {
        echo "Utente inserito: " . $_POST['txtName'];
        header("location:index.php");
    }
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Insert</title>
    </head>
    <body>
        <?php
        include_once 'menu.html';
        ?>
        <table>
            <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST">
                <tr>
                    <td>Nome:</td>
                    <td><input type="text" name="txtName" value="" /></td>
                </tr>
                <tr>
                    <td>Cognome:</td>
                    <td><input type="text" name="txtSurname" value="" /></td>
                </tr>
                <tr>
                    <td>Data di nascita:</td>
                    <td><input type="text" name="txtData" value="gg/mm/aaaa" /></td>
                </tr>
                <tr>
                    <td>Cellulare:</td>
                    <td><input type="text" name="txtCell" value="" /></td>
                </tr>
                <tr>
                    <td>Telefono:</td>
                    <td><input type="text" name="txtTel" value="" /></td>
                </tr>
                <tr>
                    <td>Fax:</td>
                    <td><input type="text" name="txtFax" value="" /></td>
                </tr>
                <tr>
                    <td>Società</td>
                    <td><input type="text" name="txtSocieta" value="" /></td>
                </tr>
                <tr>
                    <td>Carica:</td>
                    <td><input type="text" name="txtCarica" value="" /></td>
                </tr>
                <tr>
                    <td>Email 1:</td>
                    <td><input type="text" name="email1" value="" /></td>
                </tr>
                <tr>
                    <td>Email 2:</td>
                    <td><input type="text" name="email2" value="" /></td>
                </tr>
                <tr>
                    <td>Sito web:</td>
                    <td><input type="text" name="sito" value="" /></td>
                </tr>
                <tr>
                    <td>Indirizzo casa:</td>
                    <td><input type="text" name="indirizzoCasa" value="" /></td>
                </tr>
                <tr>
                    <td>Indirizzo ufficio:</td>
                    <td><input type="text" name="indirizzoUff" value="" /></td>
                </tr>
                <tr>
                    <td>
                        <input type="submit" value="submit" name="Submit" />
                    </td>
                </tr>
            </form>
        </table>
    </body>
</html>
ma i dati nn li inserisce.
il metodo PDO l'ho ripreso da un libro.