How to get WordPress Username in Array format

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I want to create an Autocomplete function in WordPress. I want a search field from where username can be searched. I am using following JQuery UI. 

<label>Users</label>

<input type="text" name="user_name" id="user-name" />

<?php

$get_arr_user = array('John', 'Rogers', 'Paul', 'Amanda', 'Peter');

?>

<script>

jQuery(document).ready(function($) {                                
var availableTags = <?php echo json_encode($get_arr_user); ?>;
$( "#user-name" ).autocomplete({
source: availableTags
});
});

</script>

My problem is that I am not able to get the list of Usernames in this format – array('John', 'Rogers', 'Paul', 'Amanda', 'Peter'); How do I get that?

3

The other answers are correct, but it’s possible to achive the same thing with less code using wp_list_pluck():

$users = get_users();
$user_names = wp_list_pluck( $users, 'display_name' );

wp_list_pluck() used that way will get the display_name field of all the users in an array without needing to do a loop.

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