Class MongoDB\Driver\Query' not found, MongoDB installed - php

Question

For this installation:
Nginx 1.11.10
Yii Framework 2.0.12 ("yiisoft/yii2-mongodb": "^2.0")
PHP MongoDB library (mongodb 1.2.9, compatible with PHP Version: PHP 5.4.0 or newer)
PHP 5.4.16
Plesk Onyx 17.0.17
No IPTables rules
Strangely enough they function when you visit the website the first time. I can also see data pulled from the Mongo database. But when visiting another page within 10-20 seconds, this error will appear:
25403#0: *170 FastCGI sent in stderr: "PHP message: PHP Fatal error: Class 'MongoDB\Driver\Query' not found in /var/www/vhosts/website.com/website.com/vendor/yiisoft/yii2-mongodb/Command.php on line 284" while reading response header from upstream
PHP Fatal Error – yii\base\ErrorException
Class 'MongoDB\Driver\Query' not found
1. in /var/www/vhosts/website.com/website.com/vendor/yiisoft/yii2-mongodb/Command.php at line 284
try {
$this->beginProfile($token, __METHOD__);
$query = new \MongoDB\Driver\Query($this->document, $options);
However, if you wait another 10-20 seconds, the website works just fine.

Answer 1

I solved it in a yii2 docker alpine nginx image, doing this:
FROM local/dmstr/php-yii2:latest-alpine-nginx
RUN apk --update add autoconf g++ make && \
pecl install mongodb
RUN echo "extension=mongodb.so" > /usr/local/etc/php/conf.d/docker-php-ext-mongodb.ini
You must install mongodb and then create an ini file for the extension on your system's php extensions directory, like I did. Remember to put extension=mongodb.so on it.