For Ando

ando_css.php

<?php

// just because this isn't wordpress..
$dummy_post = array('title'=>'the post name', 'body'=>'some post content');
$posts = array($dummy_post ,$dummy_post ,$dummy_post,$dummy_post,$dummy_post,$dummy_post );
$track_count = 0;
$posts_output = [];

foreach ($posts as $index => $post) {
 
    $this_class = '';
    
    switch ($track_count) {
        
        case 0:
            $this_class = 'classONE';
        break;
        
        case 1:
            $this_class = 'classTWO';
        break;
        
        case 2:
            $this_class = 'classTHREE';
        break;
        
        case 3:
            $this_class = 'classFOUR';
        break;
        
    }
    
    $post['className'] = $this_class;
    
    $posts_output[$index] = $post;
    
    if ($track_count == 3) {
        $track_count = 0;
    } else {
        $track_count++;
    }
}


// see it , to use it: look for 'className' inside your next posts output loop 
print_r($posts_output);

?>