The PHP version:
<?php declare(strict_types=1);
$aDims = [
'188x142' ,
'142x188' ,
'250' ,
'250x150' ,
'150' ,
'150x250' ,
];
$imgs = '';
foreach ($aDims as $id => $dims) :
$imgs .= '<div class="mga p42 bge">'
. '<img src="https://via.placeholder.com/' .$dims .'" alt="#">'
. '</div>';
endforeach;
?><!doctype html>
<html lang="en">
<head>
<title> title goes here </title>
<style>
img {outline: solid 3px lime; }
.bd1 {border: solid 1px #ddd;}
.bge {background-color: #eee;}
.dib {display: inline-block;}
.h99 {height:100%;}
.mga {margin: 2em auto;}
.p42 {padding: 0.88em;}
.tac {text-align: center;}
</style>
</head>
<body>
<h1> title goes here </h1>
<div class="bd1 p42 bgs tac">
<?= $imgs ?>
</div>
</body>
</html>