<!DOCTYPE HTML>
<html lang="ja-JP">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
</body>
<script type="text/javascript">
var x = 0;
var str = "";
do{
str += String(x);
document.getElementsByTagName("body")[0].innerHTML = str;
x++;
}while(x < 5);
</script>
</html>
01234
<?php
header("Content-type: text/html; charset=utf-8");
$x = 0;
do{
echo $x;
$x++;
}while($x < 5);
?>
01234
例：
<?php
header("Content-type: text/html; charset=utf-8");
$x = 0;
?>
<?do{?>
<article>
<header>…タイトル…</header>
<section>
…記事…
</section>
</footer>…投稿日…</footer>
</article>
<?}while($x >= 1 && $x < 5);?>