bind_param

<?
newUser( 2, 'aksjds', 'pass' );

function newUser( $email, $parent, $hash )
{
    $db = db();

    $sql =
    "INSERT INTO users
    ( email, parent, joindate, hash )
    VALUES
    ( ?, ?, now(), ? )
    ";

    if( $query = $db->prepare( $sql ) )
    {
        $bind = $query->bind_param( 'sis', $email, $parent, $hash );

        if( $bind === false )
        {
            die( 'bind_param() failed: ' . htmlspecialchars( $query->error ) );
        }

        $execute = $query->execute();

        if ( $execute === false )
        {
            die( 'execute() failed: ' . htmlspecialchars( $query->error ) );
        }

        $query->close();
    }
    else
    {
        die( 'prepare() failed: ' . htmlspecialchars( $db->error ) );
    }
}