PHP's naming convention is horribly inconsistent! So in order to make commands listed below work for you, please make sure:<ol><li>Your OS is Ubuntu 20.08</li><li>Your PHP version is 8.0</li></ol><figure class="image"><img src="https://images.unsplash.com/photo-1599507593362-50fa53ed1b40?crop=entropy&amp;cs=tinysrgb&amp;fit=max&amp;fm=jpg&amp;ixid=MnwxNTQwMTB8MHwxfHNlYXJjaHw0fHxwaHB8ZW58MHx8fHwxNjMyNDI0NTY3&amp;ixlib=rb-1.2.1&amp;q=80&amp;w=1080"><figcaption>Photo by <a target="_blank" rel="noopener noreferrer" href="https://unsplash.com/@benofthenorth?utm_source=DNX&amp;utm_medium=referral">Ben Griffiths</a> on <a target="_blank" rel="noopener noreferrer" href="https://unsplash.com/?utm_source=DNX&amp;utm_medium=referral">Unsplash</a></figcaption></figure>Let's start with the error:<pre><code class="language-plaintext" id="ZT7CDAgs3">PHP Fatal error: Uncaught Error: Class "MongoDB\Driver\Manager" not found in /var/www/dnx-mailer/vendor/mongodb/mongodb/src/Client.php:130
Stack trace:
#0 /var/www/dnx-mailer/sendInvitation.php(10): MongoDB\Client-&gt;__construct()
#1 {main}
 thrown in /var/www/dnx-mailer/vendor/mongodb/mongodb/src/Client.php on line 130</code></pre>It's easy to know:<ol><li>You're using composer</li><li>Unfortunately, <code>composer require mongodb/mongodb</code> does not install mongodb extension for you. So you would need to do this by your own.</li></ol>Not sure there is another way, I hope it can be installed by <code>apt-get</code> , like <code>apt-get install php-mongodb, or php8.0-mongodb</code> (you know what I mean - &nbsp;PHP's naming convention is horrible!) If you want to save some time, let's just do this thru <a target="_blank" rel="noopener noreferrer" href="https://pecl.php.net/">PECL&nbsp;</a> (warning - their website is very old school, like 1998.) How to install PECL?Here you go: (again, you may think it would be php8.0-pear, but it's not.)<pre><code class="language-plaintext" id="gijVv9K8r">apt-get install php-pear </code></pre>Okay can I run <code>pecl install mongodb</code> now? Sorry! not yet, otherwise, you will see this error:<pre><code class="language-plaintext" id="qMJXSW3AV">Warning: foreach() argument must be of type array|object, null given in Command.php on line 249</code></pre>Someone said, that's because php-xml is missing, so install the following, likely on php8.0-xml is needed, but install them anyway, and yes, we need specify php8.0-xxx:<pre><code class="language-plaintext" id="ltLqoxEz6">apt-get install php8.0-fpm libapache2-mod-php8.0 php8.0-mysql php8.0-xml</code></pre>Are we good now? Not, still not. There is another error:<pre><code class="language-plaintext" id="a1hf1hzCf">running: phpize
sh: 1: phpize: not found
ERROR: `phpize' failed</code></pre>We need php-dev,&nbsp;<pre><code class="language-plaintext" id="_nxWX97eB">apt-get install php8.0-dev // or php-dev works too, not sure if they are the same</code></pre>Finally, run&nbsp;<pre><code class="language-plaintext" id="7sFLifrrE">pecl install mongodb</code></pre>The last step is adding it to the php.ini, since I only use it for CLI, I add “extension=mongodb.so” to “/etc/php/8.0/cli/php.ini”.Hope this helps.<h3>Updated 09/19/2022</h3>Just setup another LAMP server, at this time, I am using PHP8.1, the process above is still valid, but just remember to change “8.0” to “8.1”. Here are additional notes:<ol><li>you don't need to install both <code>php8.1-fpm</code> and <code>libapache2-mod-php8.1</code>, fpm (FastCGI Process Manager) is for Nginx, so if you are using Apache, then it's unnecessary. (could be a&nbsp;</li><li>Since my project needs curl, I installed <code>php8.1-curl.</code> After installation, it tells me to run &nbsp;<code>a2enconf php8.1-fpm</code>. I did, but it was a disaster. &nbsp;Because I am using Apache, after enabling fpm, the MongoDB driver for PHP failed to load. I tried to reinstall everything, and then figured out I could just disable fpm by <code>a2disconf php8.1-fpm</code></li></ol>

PHP's naming convention is horribly inconsistent! In this article, we learn how to install MongoDB PHP8 Library On Ubuntu 20.08. 

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