BuddyPress.org

This seems to work for everything except site wide activity:

function my_fullname_filter($name){

$name_a = explode(\’ \’, $name);

// if there is at least two parts to the name

if (count($name_a) == 2){

// replace the last part of the name with the first letter of the last part

$name_a[count($name_a)-1] = substr($name_a[count($name_a)-1], 0, 1);

// put it all back together

$name = implode(\’ \’, $name_a);

}

return $name;

}

add_filter(\’bp_fetch_user_fullname\’,\’my_fullname_filter\’);

The activity displays store the user\’s profile link in the activity table pre-generated and there is no opportunity to filter things that already exist there. You\’ll either have to wipe the activity tables or just wait till they filter out. New activity will have the filtered full name.

If you’ve added a “last name” field, then just add instructions for the field to say “Only enter the first letter of your last name”. Simple as that isn’t it?

Here is what I would do… And what I do mostly on all of my BuddyPress installations…

In your BuddyPress->General Settings, make the “Full Name field name” be called “Display Name” or in your case “First Name/Last Initial”

That way, people know right away what you want shown there. You won’t need to baby sit them because it says right there what you want entered. Most people will follow suit, and the ones that don’t, what’s the diff?

(Notice I use my middle name here on bp.org?)

Then, create extra fields for First Name and Last Name, for yourself to use. Make them visible if you’d like, or whatever.

This way you’re not trying to create a crazy filter to micro manage anything.

i know this thread is ancient but I needed the same thing so heres some code if you need it as well

<?php
/*
Plugin Name: BuddyPress change last initial
Plugin URI: http://wpfixr.com
Description: Change the last name to use only the first initial
Author: Anthony Brown
Version: 1.0.0
Author URI: http://wpfixr.com
*/
$changeLastInitial = new changeLastInitial;
add_filter('bp_displayed_user_fullname', array(
    $changeLastInitial,
    'last_initial'
), 7, 1);
add_filter('bp_get_member_name', array(
    $changeLastInitial,
    'last_initial'
), 7, 1);
add_filter('bp_get_the_profile_field_value', array(
    $changeLastInitial,
    'last_initial_xprofle'
), 7, 3);
add_filter('bp_core_get_user_displayname', array(
    $changeLastInitial,
    'bp_core_get_user_displayname'
), 7, 2);

class changeLastInitial
{
    function bp_core_get_user_displayname($name, $id)
    {
        $name = $this->last_initial($name);
        return $name;
    }
    function last_initial_xprofle($value, $type, $id)
    {
        if ($id == 1) {
            $value = $this->last_initial($value);
        }
        return $value;
    }
    function last_initial($name)
    {
        $name_a = explode(' ', $name);
        // if there is at least two parts to the name
        if (count($name_a) == 2) {
            // replace the last part of the name with the first letter of the last part
            $name_a[count($name_a) - 1] = substr($name_a[count($name_a) - 1], 0, 1);
            // put it all back together
            $name  = implode(' ', $name_a);
        }
        return $name;
    }
}
?>