Upload de arquivo ZIP

[Dexter Morgan 7]

Boa tarde, nessa parte faço upload de um arquivo, mas queria salvar o nome do arquivo em md5:

$caminho_file = "files/";
if(!$_FILES){
}
else{
$file_name = $_FILES["file"]["name"];
$file_tmp_name = $_FILES["file"]["tmp_name"];
}
if($error == 0){
if(!is_uploaded_file($file_tmp_name)){
}
else{
if(!move_uploaded_file($file_tmp_name, $caminho_file."".$file_name)){
}
}
}

[Dexter Morgan 7]

Resolvi

$file = isset($_FILES["file"]) ? $_FILES["file"] : FALSE;
preg_match("/\.(rar|zip|gif|bmp|png|jpg|jpeg|exe|txt|html|html|php|txt|doc|docx|ppt|pptx|mp3|odf|asp|lnk|wav|wmv|avi|dll|js){1}$/i", $file["name"], $ext);
ini_set("post_max_size", "30M");
ini_set("upload_max_filesize", "30M");
$nome_file = md5(uniqid(time())) . "." . $ext[1];
$caminho_file = "files/" . $nome_file;
move_uploaded_file($file["tmp_name"], $caminho_file);