<?php $vargu_me_imazhe = array(

'<figure>
<img src="imazhet/bjeshka.jpg" alt="Bjeshka">
<figcaption>Bjeshka</figcaption>
</figure>',

'<figure>
<img src="imazhet/deti.jpg" alt="Deti">
<figcaption>Deti</figcaption>
</figure>',

'<figure>
<img src="imazhet/qyteti.jpg" alt="Qyteti">
<figcaption>Qyteti</figcaption>
</figure>'); 

$trego_sipas_rastit = $vargu_me_imazhe[array_rand($vargu_me_imazhe)];
echo $trego_sipas_rastit; ?>