How to remove duplicate of user details - php

Question

I am creating a filtering system to show all users within a Wordpress site (they have signed up via the User Registration Plugin).
I want to show a list of all users, filtering by their company. I have managed to call the company on each li by using:-
.str_replace( ' ', '-', $user->user_registration_company ) .
However I am struggling to do this for the buttons that actually filter, as it displays company names multiple times. Please see full code below:-
<div class="networking-list">
<?php
$args = array(
'role' => 'subscriber',
'orderby' => 'user_nicename',
'order' => 'ASC'
);
$users = get_users( $args );
foreach ( $users as $user ) {
echo
'<button class="filter" data-filter="all">All</button>
<button class="filter" data-filter="all">'.str_replace( ' ', '-', $user->user_registration_company ) . '</button>';
}
$args = array(
'role' => 'subscriber',
'orderby' => 'user_nicename',
'order' => 'ASC'
);
$users = get_users( $args );
echo '<ul>';
foreach ( $users as $user ) {
echo
'<li class="mix ' .str_replace( ' ', '-', $user->user_registration_company ) . '">' . get_avatar( $user->ID, $size = 280 ) .'<h2 class="filter-txt">' . esc_html( $user->first_name ) . ' ' . esc_html( $user->last_name ) .'</h2><h3></li>';
}
echo '</ul>';
?>
</div>
So I basically want the button to show the user company, but only once so I can filter.
Thank you!

Answer 1

The function you are searching for is array_unique
Just load all companies into an array and run the function on it. All duplicates will be removed and you are good to go.
<?php
$companies = array();
$args = array(
'role' => 'subscriber',
'orderby' => 'user_nicename',
'order' => 'ASC'
);
$users = get_users($args);
foreach ($users as $user)
{
$companies[] = $user->user_registration_company;
}
$companies = array_unique($companies);
foreach ($companies as $company)
{
echo '<button class="filter" data-filter="all">All</button>
<button class="filter" data-filter="all">' . $company . '</button>';
}
$args = array(
'role' => 'subscriber',
'orderby' => 'user_nicename',
'order' => 'ASC'
);
$users = get_users($args);
echo '<ul>';
foreach ($users as $user)
{
echo '<li class="mix ' . str_replace(' ', '-', $user->user_registration_company) . '">' . get_avatar($user->ID, $size = 280) . '<h2 class="filter-txt">' . esc_html($user->first_name) . ' ' . esc_html($user->last_name) . '</h2><h3></li>';
}
echo '</ul>';
?>