Remove duplicates

<?php // removes duplicated files in a dir

$dir = scandir(".");
$_md5 = array();

foreach($dir as $i=>$file) {
    if($file == "." || $file == "..") continue;

    $md5 = md5(file_get_contents($file));
    if(!in_array($md5, $_md5)) {
        $_md5[] = $md5;
    } else {
        unlink($file);
    }
}