<?

$con = new Mongo();// Подключение Mongo
$dbname = $con->selectDB('laba');

$kols = array();

$kols = $dbname->getCollectionNames();

$data = array();

foreach ($kols as $kol) {
	// Перебор заголовков таблицы
	$heads = array();
	$bool = true;
	foreach($dbname->$kol->find() as $collection){
		if(!$bool){
				break;
			}
		foreach ($collection as $key => $value){
			$heads[] = $key;
		}
		$bool = false;
	}
	foreach ($heads as $head) {
		if($_GET["id"] == "on"){
			$data[] = $dbname->$kol->find(array("_id" => new MongoId($_GET["text"])));
		}
			$data[] = $dbname->$kol->find(array($head => $_GET["text"]));
	}
}


if($_GET["id"] == "on"){
	$bool = true;

	foreach ($data as $dat) {
		if(!$bool){
			break;
		}
		foreach ($dat as $da) {
			print_r($da);
			$bool = false;
			break;
		}
	}
}
else{
	foreach ($data as $dat) {
		foreach ($dat as $da) {
			print_r($da);
			echo "<br>";
		}
	}
}

?>


====
	<form action="/find.php" method="get">
	<br>
		<input type="checkbox" name="id"> Это ид<br>
		<input type="text" name="text"><br>
		<br>
		<button type="submit">Поиск</button>
	</form>