View file sys/inc/random_logos.php

<?php 
function rand_logos($patch = "pic/logos/") 
{ 
if(!$dir = opendir($patch)) return "Это не директория"; 
while(($t = readdir($dir)) !== false) 
{ 
$ext = substr(strrchr($t,'.'), 1); 
if(is_file($t) && ($ext == "gif") || ($ext == "jpg") || ($ext == "png")) 
{ 
$filename[] = $patch."/".$t; 
} 
} 

closedir($dir); 
$index = rand(0, count($filename) - 1); 
$foto = "<img src=".$filename[$index].">"; 
return $foto; 
} 
echo rand_logos();
?>