[Ask]is php pdo is protect from sql injection ?

This is my code

PHP Code:


			
function clean($data) {

        if ( !isset($data) or empty($data) ) return '';

        if ( is_numeric($data) ) return $data;



        $non_displayables = array(

            '/%0[0-8bcef]/',            // url encoded 00-08, 11, 12, 14, 15

            '/%1[0-9a-f]/',             // url encoded 16-31

            '/[\x00-\x08]/',            // 00-08

            '/\x0b/',                   // 11

            '/\x0c/',                   // 12

            '/[\x0e-\x1f]/'             // 14-31

        );

        foreach ( $non_displayables as $regex )

            $data = preg_replace( $regex, '', $data );

        $data = str_replace("'", "''", $data );

        return $data;

}

PHP Code:


			
    $username = clean($_POST['username']);

    $password = clean($_POST['password']);

    $password2 = clean($_POST['password2']);

    $delpass = clean($_POST['delpassword']);

    $delpass2 = clean($_POST['delpassword2']);

    $email = clean($_POST['email']);

PHP Code:


			
// Query

        $register = $db->prepare("EXEC ACCOUNT_DBF.dbo.usp_CreateNewAccount :user, :pass, :delpass, :email");

        $register->BindParam(':user',$username);

        $register->BindParam(':pass',md5($sv_md5hash.($password2)));

        $register->BindParam(':delpass',$delpass2);

        $register->BindParam(':email',$email);

        $register->execute();

i want to ask is this safe frome sql injection ??