Send email to users when they get new followers

I’m using a simple plugin “user following system” And all what i need to do is sending an email after the users get a new followers.

I think this is the important part of the plugin code:

function pwuf_follow_user( $user_id, $user_to_follow ) {

$following = pwuf_get_following( $user_id );

if ( $following && is_array( $following ) ) {
$following[] = $user_to_follow;
} else {
$following = array();
$following[] = $user_to_follow;
}

// retrieve the IDs of all users who are following $user_to_follow
$followers = pwuf_get_followers( $user_to_follow );

if ( $followers && is_array( $followers ) ) {
$followers[] = $user_id;
} else {
$followers = array();
$followers[] = $user_id;
}

do_action( ‘pwuf_pre_follow_user’, $user_id, $user_to_follow );

// update the IDs that this user is following
$followed = update_user_meta( $user_id, ‘_pwuf_following’, $following );

// update the IDs that follow $user_id
$followers = update_user_meta( $user_to_follow, ‘_pwuf_followers’, $followers );

// increase the followers count
$followed_count = pwuf_increase_followed_by_count( $user_to_follow ) ;

if ( $followed ) {

do_action( ‘pwuf_post_follow_user’, $user_id, $user_to_follow );

return true;
}
return false;
}

and here to check if a user is following another:

function pwuf_is_following( $user_id, $followed_user ) {

$following = pwuf_get_following( $user_id );

$ret = false; // is not following by default

if ( is_array( $following ) && in_array( $followed_user, $following ) ) {
$ret = true; // is following
}

return $ret;
}

I tried to add this code after updating the user meta but nothing happen!

$subscribers = explode(“,”, $user_to_follow );
$emails = array ();

foreach ( $subscribers as $subscriber ) {
$user_info = get_userdata($subscriber);
$emails[] = $user_info ->user_email;
}
$body = sprintf( $user_to_follow->display_name, ‘followed your work! See <%s>’ );

wp_mail( $emails, ‘New followers!’, $body );

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