PHP ile:
<?php
$ipuclari = [
"İpucu 1", "İpucu 2", "İpucu 3"
];
?>
<div class="ipucu"><?php echo array_rand($ipuclari); ?></div>

JS ile:
<div class="ipucu"></div>
<script>
var ipuclari = [
"İpucu 1", "İpucu 2", "İpucu 3"
];
document.querySelector(".ipucu").innerHTML = ipuclari[Math.floor(ipuclari.length*Math.random())];
</script>