Programmatically Create a User in WordPress

gistfile1.txt

$user_name = 'username';
$user_email = 'email';
$random_password = wp_generate_password( $length=12, $include_standard_special_chars=false );

$user_id = username_exists( $user_name );
if ( !$user_id and email_exists($user_email) == false ) {
	$user_id = wp_create_user( $user_name, $random_password, $user_email );
	$user = get_user_by( 'id', $user_id );
    // Remove role
    $user->remove_role( 'subscriber' );

    // Add role
    $user->add_role( 'administrator' );
} else {
	$random_password = __('User already exists.  Password inherited.');
}