Vitaliy Orlov

(function() {
    console.log('loaded');
})();

RewriteEngine On
RewriteCond %{ENV:REDIRECT_STATUS} !=503
RewriteRule ^ stub.html [L, R=503]

<?php
$arr = [
        [
            "window" => 01,
            "services" => "Asd",
            "clients_count" => 4
        ],
        [
            "window" => 02,
            "services" => "Asd",
            "clients_count" => 3
        ]
    ];

usort($arr, function($a, $b){
    return $a['clients_count'] > $b['clients_count'];
});

print_r($arr[0]);

Array ( [window] => 2 [services] => Asd [clients_count] => 3 )

<div id="tab-controls">
    <button data-tab="tab-1">Tab 1</button>
    <button data-tab="tab-2">Tab 2</button>
    <button data-tab="tab-3">Tab 3</button>
</div>

<div id="tab-1">
    <button id="tab-1-filter-1">Filter 1</button>
    <button id="tab-1-filter-2">Filter 2</button>
    <button id="tab-1-filter-3">Filter 3</button>
    <div clas="tab-content">
         <div class="tab-1-element filter-1 filter-2" ></div>
    ...
    </div>
</div>

<script>
$('#tab-1-filter-1').click(e=>{
      $('.tab-1-element').hide().filter(':has(.filter-1)').show();
});
</script>

...
    let scroller = ()=>{
      $('html,body').animate({
        scrollTop: firstFeedItem.offset().top
      }, 300, ()=>{
      	if (~~$(window).scrollTop() < ~~(firstFeedItem.offset().top)) {
        	scroller();
        }
      });
    };
    
    scroller();
...

if (mail($to, $subject, $message, $headers)) {
echo 'OK';
} else {
echo 'NOT OK';
}

mail -s "Test Subject" user@example.com < /dev/null