Place Files Into Folder of Same Name

<?php
//place all video files in the current directory into a folder of same name
$dir = ".";

$extensions = array("avi", "mkv", "wmv", "3gp", "mp4");

if($dh = opendir($dir)){
    while(($file = readdir($dh)) !== false){
        $temp = explode(".", $file);
        $ext = array_pop($temp);
        $file_name = implode($temp);
        if(filetype($file) == "file" && in_array($ext, $extensions)){
            echo "filename: $file : filetype: ".filetype($file)."\n";
            if(mkdir("$file_name")){
                if(rename($file, $file_name."/".$file)){
                    echo "Succesfully Moved To: $file_name / $file\n\n";
                }
            }
        }
    }
    closedir($dh);
}