Error Install Doctrine-odm MongoDb in Symfony - php

Question

I have few problems with mongoDb and Symfony.
I installed php driver 1.6.12 and I want to install mongoDbBundle
add these lines in my composer.json
{
"require": {
"doctrine/mongodb-odm": "~1.0",
"doctrine/mongodb-odm-bundle": "~3.0"
},
}
and Then
php composer.phar update doctrine/mongodb-odm doctrine/mongodb-odm-bundle
But I Have these error
Your requirements could not be resolved to an installable set of packages.
Problem 1
- doctrine/mongodb-odm 1.0.0 requires doctrine/mongodb ~1.2 -> satisfiable by doctrine/mongodb[1.2.0, 1.2.1].
- doctrine/mongodb-odm 1.0.1 requires doctrine/mongodb ~1.2 -> satisfiable by doctrine/mongodb[1.2.0, 1.2.1].
- doctrine/mongodb-odm 1.0.2 requires doctrine/mongodb ~1.2 -> satisfiable by doctrine/mongodb[1.2.0, 1.2.1].
- doctrine/mongodb-odm 1.0.3 requires doctrine/mongodb ~1.2 -> satisfiable by doctrine/mongodb[1.2.0, 1.2.1].
- doctrine/mongodb-odm 1.0.4 requires doctrine/mongodb ~1.2 -> satisfiable by doctrine/mongodb[1.2.0, 1.2.1].
- doctrine/mongodb 1.2.1 requires ext-mongo ^1.2.12 -> the requested PHP extension mongo is missing from your system.
- doctrine/mongodb 1.2.0 requires ext-mongo ^1.2.12 -> the requested PHP extension mongo is missing from your system.
- Installation request for doctrine/mongodb-odm ~1.0 -> satisfiable by doctrine/mongodb-odm[1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4].

Answer 1

As you can see, the doctrine/mongodb-odm dependency requires mongo PHP extension to be installed and enabled in your PHP installation.
You can check if you have it by looking into your php.ini file and/or on a page with phpinfo(). If it's not installed/enabled, you have to do it, otherwise you can't install those dependencies.