composer install symfony2 doctrine mongodb problémes

Bonjour à tous,

Je suis débutant pour symfony 2 et j'ai trouvé plusieurs problèmes.

J'ai cloné un projet symfony 2 existant.

aprés j'ai exécuté la commande composer install. il m'affiche les problèmes suivantes.

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Warning: PHP Startup: Unable to load dynamic library 'c:/wamp64/bin/php/php5.6.25/ext/mongo.so' - Le module spÚcifiÚ est introuvable.
 in Unknown on line 0
 
Warning: PHP Startup: Unable to load dynamic library 'c:/wamp64/bin/php/php5.6.25/ext/intl.so' - Le module spÚcifiÚ est introuvable.
 in Unknown on line 0
Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Your requirements could not be resolved to an installable set of packages.
 
  Problem 1
    - Installation request for doctrine/mongodb 1.4.0 -> satisfiable by doctrine/mongodb[1.4.0].
    - doctrine/mongodb 1.4.0 requires ext-mongo ^1.5 -> the requested PHP extension mongo is missing from your system.
  Problem 2
    - doctrine/mongodb 1.4.0 requires ext-mongo ^1.5 -> the requested PHP extension mongo is missing from your system.
    - doctrine/mongodb-odm 1.1.2 requires doctrine/mongodb ~1.3 -> satisfiable by doctrine/mongodb[1.4.0].
    - Installation request for doctrine/mongodb-odm 1.1.2 -> satisfiable by doctrine/mongodb-odm[1.1.2].
 
  To enable extensions, verify that they are enabled in your .ini files:
    - C:\wamp64\bin\php\php5.6.25\php.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

J' ai ajouté le php_mongo.dll au dossier C:\wamp64\bin\php\php5.6.25\ext
et j'ai edité le fichier php.ini : j'ai ajouté ce ligne extension=php_mongo.dll
Je ne sais pas pourquoi il me demande mongo.so sous ext. De plus j'ai taper la commande php -m et je n'a pas trouvé le module mongo.

ceci le fichier composer.json

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{
    "name": "root/my_project",
    "license": "proprietary",
    "type": "project",
    "autoload": {
        "psr-4": {
            "": "src/"
        },
        "classmap": [
            "app/AppKernel.php",
            "app/AppCache.php"
        ]
    },
    "require": {
        "php": ">=5.3.9",
        "symfony/symfony": "2.8.*",
        "doctrine/orm": "^2.4.8",
        "doctrine/doctrine-bundle": "~1.4",
        "symfony/swiftmailer-bundle": "~2.3",
        "symfony/monolog-bundle": "~2.11.3",
        "sensio/distribution-bundle": "~5.0",
        "sensio/framework-extra-bundle": "^3.0.2",
        "incenteev/composer-parameter-handler": "~2.0",
        "doctrine/mongodb-odm": "^1.0",
        "doctrine/mongodb-odm-bundle": "^3.0",
        "friendsofsymfony/user-bundle": "~2.0@dev"
    },
    "require-dev": {
        "sensio/generator-bundle": "~3.0",
        "symfony/phpunit-bridge": "~2.7"
    },
    "scripts": {
        "symfony-scripts": [
            "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::prepareDeploymentTarget"
        ],
        "post-install-cmd": [
            "@symfony-scripts"
        ],
        "post-update-cmd": [
            "@symfony-scripts"
        ]
    },
    "config": {
        "bin-dir": "bin"
    },
    "extra": {
        "symfony-app-dir": "app",
        "symfony-web-dir": "web",
        "symfony-assets-install": "relative",
        "incenteev-parameters": {
            "file": "app/config/parameters.yml"
        },
        "branch-alias": null
    }
}

Merci d'avance.