When executing following PHP code:
$m = new MongoClient("mongodb://localhost:27017");
Fatal error: Class 'MongoClient' not found in (...)
echo extension_loaded("mongodb") ? "loaded\n" : "not loaded\n";
As the documentation is prompting it, the class is deprecated.
Warning This extension that defines this class is deprecated. Instead, the MongoDB extension should be used. Alternatives to this class include:
From what I read on their github repository release history, the class you are trying to use have been obsoleted since the version of
mongodb 1.0.0, so there is an high chance that, on the version
1.6.0 you are, this is not even part of the
That is also confirmed by this issue on their github
derickr commented on Apr 16
MongoClient is a class from the old legacy driver and is not supposed to be available in this one. The new driver has \MongoDB\Driver\Manager, and, the accompanying library has \MongoDB\Client.
You either need to install the old legacy extension (pecl install mongo) and use PHP 5.x, or update your code to use this new driver's classes as the old driver is not available for PHP 7. There is an upgrade guide at http://mongodb.github.io/mongo-php-library/upgrade-guide/
Here is the replacement class documentation and the snippet of code that should replace yours :
$m = new MongoDB\Driver\Manager("mongodb://localhost:27017");
Another way, as suggested by the MongoDB member quoted here above is to use this pecl extension: https://pecl.php.net/package/mongo instead of https://pecl.php.net/package/mongodb but please also notice the warning there stating:
This package has been superseded, but is still maintained for bugs and security fixes.