<?php



// folder directory which contains images files

$folder="randompic/";



$openfold=opendir($folder);



while($files=readdir($openfold))

{

// put file names into a table

if(is_file($folder.$files))

 $tabjpg[]=$files;

}

srand ((double) microtime() * 10000000);  

$rand_keys = array_rand ($tabjpg);

echo "<img src="".$folder.$tabjpg[$rand_keys]."" alt="".$tabjpg[$rand_keys]."">";

?>