<?php
$data[0] = '<img src="/images/1.png" alt="reklam1" width="180" height="300" /></a>';
$data[1] = '<img src="/images2.png" alt="reklam2" width="180" height="300" /></a>';
$data[2] = '<img src="/images/3.png" alt="reklam3" width="180" height="300" /></a>';
$data[3] = '<img src="/images/4.png" alt="reklam4" width="180" height="300" /></a>';

shuffle($data);

echo $data[0];
echo $data[1];
echo $data[2];
echo $data[3];
?>