get users search not working with array

Question

Here's my code:

function prefix_get_users(){
   $args=array(
      'blog_id' => $GLOBALS['blog_id'],
      'search'  => 'mark'
   );
   $all_users=get_users($args);
   $arr=array();
   foreach ($all_users as $val) {
      $arr[]=$val->data->user_login;
   }
   $resp = array (
       'success'    => true,
       'data'       => json_encode($arr)
   );
   wp_send_json($resp);

 }

The code is working by getting all the user successfully but when to try to use search it's not working and give me empty array by ajax (data[])

Answer 1

get_users looks for an exact match for the value in search in the email address, URL, ID, username or display_name fields... it doesn't look in the first name field.

As you can't search the first name directly, you could instead look for people with a username or display name that starts with it by using the wildcard * in the search string, e.g.:

$args=array(
   'blog_id' => $GLOBALS['blog_id'],
   'search'  => 'mark*'   /* Note the * wildcard to match anything starting with "mark" */
);
$all_users=get_users($args);
[...]