How do I get the user firstname in wordpress?

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Here’s my code in wordpress functions.php. I want to display user information in gravity form fields The top function works but the bottom doesn’t and I can’t figure out what to use to display first name. 

add_filter('gform_field_value_pm_id', 'populate_pm_id');
function populate_pm_id($value){
    return $user_ID = get_current_user_id(); 
    echo $user_ID = get_current_user_id(); 

}

add_filter('gform_field_value_pm_firstname', 'populate_pm_firstname');
function populate_pm_firstname($value){
    return $user_info->first_name = get current_user_first_name(); 
    echo $user_info->first_name = get_current_user_first_name();

}
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2 comments

  1. Try this code to get user first name and last name.

    <?php 
      $user_info = get_userdata(get_current_user_id());
      $first_name = $user_info->first_name;
      $last_name = $user_info->last_name;
      echo "$first_name $last_name";
?>

  2. yo can get the user and its data via

    $current_user = wp_get_current_user();

    to get the first name from that object, you need to

    $first_name = $current_user->user_firstname;

    you will still get an user object, even if you are not logged in.
    here is a var_dump on a non-logged-in user:

    object(WP_User)#1265 (8) {
  ["data"]=> object(stdClass)#1267 (0) {}
  ["ID"]=> int(0)
  ["caps"]=> array(0) {}
  ["cap_key"]=> NULL
  ["roles"]=> array(0) {}
  ["allcaps"]=> array(0) {}
  ["filter"]=> NULL
  ["site_id":"WP_User":private]=> int(0)
}

    more infos and details here.