Change Member Username with Xprofile Fullname

yzc_change_member_username.php

<?php

/**
 * Change Member Username with Xprofile Fullname
 */
function yzc_change_member_username( $member_name ) {

    // Get User Id.
    $user_id = bp_get_member_user_id() ? bp_get_member_user_id() : 0;

    if ( $user_id == 0 ) {
        return $member_name;
    }

    // Get Fields IDs.
    $first_name_id = 1;
    $last_name_id = 2;

    // First Name
    $first_name = xprofile_get_field( $first_name_id, $user_id );
    $last_name = xprofile_get_field( $last_name_id, $user_id );

    // Get User Full Name.
    $fullname = $first_name->data->value . ' ' . $last_name->data->value;

    if ( empty( $fullname ) ) {
        $fullname = $member_name;
    }

    return $fullname;

}

function yzc_change_member_username_with_custom_fields( $member_name, $user_id ) {
    $first_name = xprofile_get_field_data( 130, $user_id );
    $last_name = xprofile_get_field_data( 131, $user_id );
    // Get User Full Name.
    $fullname = $first_name;
    if ( ! empty( $last_name ) ) {
        $fullname .= "  " . $last_name;
    }
    if ( empty( $fullname ) ) {
        $fullname = $member_name;
    }
    return $fullname;
}
add_filter( 'bp_core_get_user_displayname', 'yzc_change_member_username_with_custom_fields', 100, 2 );
add_filter( 'bp_member_name' , 'yzc_change_member_username' );


add_filter( 'bp_get_group_member_link' , 'yzc_get_group_member_link' );

function yzc_get_group_member_link() {
    global $members_template;
    $first_name = xprofile_get_field_data( 130, $user_id );
    $last_name = xprofile_get_field_data( 131, $user_id );
    // Get User Full Name.
    $fullname = $first_name;
    if ( ! empty( $last_name ) ) {
        $fullname .= "  " . $last_name;
    }
    if ( empty( $fullname ) ) {
        $fullname = $member_name;
    }
   
    return '<a href="' . bp_core_get_user_domain( $members_template->member->user_id, $members_template->member->user_nicename, $members_template->member->user_login ) . '">' . $fullname . '</a>';
}