Edit
<!-- components/atoms/Avatars.php -->
<!-- components/atoms/avatar.php -->
<?php
$sizes = [60, 100, 140, 200];
$dimension = [];
for($i = 0 ; $i < 4; $i++ ){
$dimension[$i] = $sizes[$i]."x".$sizes[$i];
}
?>
<?php for($i = 0 ; $i < 4; $i++ ): ?>
<img class="w3-circle w3-image" src="https://dummyimage.com/<?=$dimension[$i]?>/eee/000">
<?php endfor ?>