Laravel 4:找不到"MongoClient"类

我在WAMP上安装了Laravel 4,它与MySQL后端配合得很好.

我已成功设置第二个虚拟主机,并希望使用MongoDB后端.在搜索之后,我发现Laravel本身并没有连接到MongoDB,我发现https://github.com/jenssegers/Laravel-MongoDB,我一直试图设置它,但我似乎无法做到正确.显然我一定是做错了什么,我希望有人可以帮助我找出我做得不对的事情.

我composer.json根据说明编辑:

............
"license": "MIT",
"require": {
    "laravel/framework": "4.1.*",
    "jenssegers/mongodb": "*"
},
"autoload": {
.........

然后我跑了composer update.它安装了monolog 1.9.1和swiftmailer v5.2.0 - 无论这些是什么 - 成功(几天前)但之后又抛出了一个错误.今天我试着composer update再次运行,它分别将两个更新为1.10.0和v5.2.1,然后遇到了同样的错误.现在,当我尝试composer update它时,始终会抛出同样的错误:

Nothing to install or update
Generating autoload files
{"error":{"type":"Symfony\\Component\\Debug\\Exception\\FatalErrorException","me
ssage":"Class 'MongoClient' not found","file":"C:\\wamp\\www\\laravel\\vendor\\j
enssegers\\mongodb\\src\\Jenssegers\\Mongodb\\Connection.php","line":132}}Script
 php artisan clear-compiled handling the post-update-cmd event returned with an
error  


  [RuntimeException]
  Error Output:    


update [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--lock]
 [--no-plugins] [--no-custom-installers] [--no-scripts] [--no-progress] [--with-
dependencies] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [packages1] ... [
packagesN]

我尝试过的:

我已经下载并安装了php_mongo.dll,方法是将它放在php ext文件夹中并在php.ini中启用它:

; added for mongoDB connections
extension=php_mongo.dll

但这没有帮助.