River Tam River Tam - 1 year ago 156
Linux Question

PHP Fatal Error: Class 'MongoClient' not found

I have a site using Apache that is just the following code:

<?php $m = new MongoClient(); ?>

and when I try to access it, I get the error in error.log

`PHP Fatal Error: Class 'MongoClient' not found`

The following are settings which might be wrong, but I don't think are.

php -i | grep 'Configuration'
Configuration File (php.ini) Path => /etc/php5/cli | Loaded Configuration File => /etc/php5/cli/php.ini

grep 'mongo' /etc/php5/cli/php.ini

php -i | grep 'extension'
extension_dir => /usr/lib/php5/20121212 => /usr/lib/php5/20121212

ls /usr/lib/php5/20121212/ | grep 'mongo.so'

I haven't been able to find anything to suggest I installed it wrong or have it wrongly configured. I installed it within the past two hours using
sudo pear install -f pecl/mongo
sudo pecl install mongo

I've restarted my Apache and even my computer multiple times.

So why am I getting the error
Class 'MongoClient' not found

I'm on Ubuntu. PHP version 5.5.

Edit: I've just discovered that MongoClient is valid when I run php in interactive mode. Perhaps it has to do with a user permission/user installation issue?

Answer Source

The problem was that I was using php -i | grep 'Configuration' to find the .ini file. This lead to /etc/php5/cli/php.ini. In retrospect, this should have been an obvious giveaway: cli means command line interface, basically for the interpreter. What I needed was the ini file that Apache was using.

Unfortunately, there was no great way to do this as I couldn't log into the www-data user, but I made a file that had the code


and that revealed that the .ini file location was actually /etc/php5/apache2/php.ini.

Once I updated that ini file with extension=mongo.so, the module was loaded at startup, so I restarted and everything is working now.