Add troubleshooting for PHP install (#38239)

* Add troubleshooting for PHP install.

Co-authored-by: jonathansadowski <jonathansadowski@users.noreply.github.com>

---------

Co-authored-by: jonathansadowski <jonathansadowski@users.noreply.github.com>

DEVELOPMENT.md

@@ -90,3 +90,25 @@ pnpm -- wp-env destroy
 Each of the [plugins in our repository](plugins) support using this tool to spin up a development environment. Note that rather than having a single top-level environment, each plugin has its own. This is done in order to prevent conflicts between them.
 
 Please check out [the official documentation](https://developer.wordpress.org/block-editor/reference-guides/packages/packages-env/) if you would like to learn more about this tool.
+
+## Troubleshooting
+
+### Installing PHP in Unix (e.g. Ubuntu)
+
+Many unix systems such as Ubuntu will have PHP already installed. Sometimes without the extra packages you need to run WordPress and this will cause you to run into troubles.
+
+Use your package manager to add the extra PHP packages you'll need.
+e.g. in Ubuntu you can run:
+
+```
+sudo apt update
+sudo apt install php-bcmath \
+                 php-curl \
+                 php-imagick \
+                 php-intl \
+                 php-json \
+                 php-mbstring \
+                 php-mysql \
+                 php-xml \
+                 php-zip
+```

README.md

@@ -12,7 +12,7 @@ To get up and running within the WooCommerce Monorepo, you will need to make sur
 
 -   [NVM](https://github.com/nvm-sh/nvm#installing-and-updating): While you can always install Node through other means, we recommend using NVM to ensure you're aligned with the version used by our development teams. Our repository contains [an `.nvmrc` file](.nvmrc) which helps ensure you are using the correct version of Node.
 -   [PNPM](https://pnpm.io/installation): Our repository utilizes PNPM to manage project dependencies and run various scripts involved in building and testing projects.
--   [PHP 7.2+](https://www.php.net/manual/en/install.php): WooCommerce Core currently features a minimum PHP version of 7.2. It is also needed to run Composer and various project build scripts.
+-   [PHP 7.2+](https://www.php.net/manual/en/install.php): WooCommerce Core currently features a minimum PHP version of 7.2. It is also needed to run Composer and various project build scripts. See [troubleshooting](DEVELOPMENT.md#troubleshooting) for troubleshooting problems installing PHP.
 -   [Composer](https://getcomposer.org/doc/00-intro.md): We use Composer to manage all of the dependencies for PHP packages and plugins.
 
 Once you've installed all of the prerequisites, you can run the following commands to get everything working.