<?php
$a = "../../"; # evil link
if ( $a && $a != "." ) {
foreach ( split("/", $a) as $part )
if ( $part != "." && $part != ".." && $part != "" ) {
$b .= "/".$part; $c[] = $part;
} #endif
if ( ! $b )
$b = ".";
} else {
$b = "."; $c[] = ".";
}
echo '$a è "'.$a . '"<br />';
echo '$b è "'.$b . '"<br />';
print_r($c);
?>