Probleme avec l'insertion a la base de donnees

Salut! bonsoir cava?

j'ai un petit problème avec mon code PHP

je veut créer une page PHP d'inscription
voilà le code
inscription.php
<?php

session_start();

?>

<?php

if( isset($_SESSION['ERRMSG_ARR']) && is_array($_SESSION['ERRMSG_ARR']) && count($_SESSION['ERRMSG_ARR']) >0 ) {

echo '<ul style="padding:0; color:red;">';

foreach($_SESSION['ERRMSG_ARR'] as $msg) {

echo '<li>',$msg,'</li>';

}

echo '</ul>';

unset($_SESSION['ERRMSG_ARR']);

}

?>

<form action="reg.php" method="POST">

Username:<br>

<input type="text" name="username" /><br>

Password:<br>

<input type="password" name="password" /><br>

Confirmation Password:<br>

<input type="password" name="conf_password" /><br>

Email:<br>

<input type="text" name="email" /><br>

<input type="submit" value="Save" />

</form>
et voila l'autre page

reg.php

<?php

function VerifMail($email)
{
$syntaxe='#^[w.-]+@[w.-]+.[a-zA-Z]{2,5}$#';

if(preg_match($syntaxe,$email)) return true;
else return false;
}
session_start();

$errmsg_arr = array();

$errflag = false;

// configuration

$dbhost = "localhost";

$dbname = "member";

$dbuser = "root";

$dbpass = "";

// database connection

$conn = new PDO("mysql:host=$dbhost;dbname=$dbname",$dbuser,$dbpass);

// new data

$username = $_POST['username'];

$password = $_POST['password'];

$email = $_POST['email'];

$conf_password = $_POST['conf_password'];

// Vérification de la validité des informations

if($username == '') {

$errmsg_arr[] = 'You must enter your Username';

$errflag = true;

}

//username occupee ou nn

if($password == '') {

$errmsg_arr[] = 'You must enter your Password';

$errflag = true;

}

if(!($password ==$conf_password) ) {

$errmsg_arr[] = 'Passwords are not compatible';

$errflag = true;

}

if($email == '') {

$errmsg_arr[] = 'You must enter your Email';

$errflag = true;

}

if((VerifMail($email))) {

$errmsg_arr[] = 'You must enter a valid Email';

$errflag = true;

}

if($errflag) {

$_SESSION['ERRMSG_ARR'] = $errmsg_arr;

session_write_close();

header("location: inscription.php");

exit();

}

// query
mysql_query("INSERT INTO 'users'(pseudo,password,email) VALUES ('$title','$author','$name','$copy')");

$sql = "INSERT INTO users (username,password,email) VALUES (:usename,:password,:email)";

$q = $conn->prepare($sql);

$q->execute(array(
'username'=>$username,
'password'=>$password,
'email'=>$email
));

header("location: home.php");
?>

j'ai besoin de l'aide le plus vte possible

mrc a vous