GravityForms autocreate preformatted Username

gf_autoname.php

<?

// Set up a GF and use a name field, this use the first and last name to create intials as part of the username
// Add this to your functions.php
// This is preformatted to produce a username that is pk_usersinitials_3 digit random number
// The username is created when the form is submitted

/ Change 3 in gform_username_3 to your form id number.
add_filter( 'gform_username_3', 'auto_username', 10, 4 );
function auto_username( $username, $feed, $form, $entry ) {
    GFCommon::log_debug( __METHOD__ . '(): running.' );
    // Update 2.3 and 2.6 with the id numbers of your Name field inputs. e.g. If your Name field has id 1 the inputs would be 1.3 and 1.6
    
 //Gets the values from the first and last name fields
    $firstName = ucwords( rgar( $entry, '1.3' ));
    $lastName = ucwords( rgar( $entry, '1.6' ));

    // Convert the names to intials
    $firstChar = substr($firstName, 0, 1);
    $secondChar = substr($lastName, 0, 1);
    
     // Generates a random 3 digit number to add to the end
    $randomNum = substr(str_shuffle("0123456789"), 0, 3);
    
    // Create the username for the account
    $username = 'pk_' . $firstChar . $secondChar .'_' . $randomNum;

	
    if ( empty( $username ) ) {
        GFCommon::log_debug( __METHOD__ . '(): Value for username is empty.' );
        return $username;
    }
  
    if ( ! function_exists( 'username_exists' ) ) {
        require_once( ABSPATH . WPINC . '/registration.php' );
    }
  
    if ( username_exists( $username ) ) {
        GFCommon::log_debug( __METHOD__ . '(): Username already exists, generating a new one.' );
        $i = 2;
        while ( username_exists( $username . $i ) ) {
            $i++;
        }
        $username = $username . $i;
        GFCommon::log_debug( __METHOD__ . '(): New username: ' . $username );
    };
  
    return $username;
}
?>