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解答例

PHP

<?php
header("Content-type: text/html; charset=utf-8");

$counter = array("image0.gif",
				"image1.gif",
				"image2.gif",
				"image3.gif");
				
//乱数ジェネレータを初期化
srand(microtime() * 1000000);

//ランダムにデータを取り出す
$data  =array_rand($counter);

$html = "<img src=\"counter/" . $counter[$data] . "\"><br><br>";

//ランダムに2つのデータを取り出す
$data = array_rand($counter, 2);

$html .= "<img src=\"counter/" . $counter[$data[0]] . "\">";
$html .= "<img src=\"counter/" . $counter[$data[1]] . "\">";

echo $html;
?>

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