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Monolyth/Envy

Flexible environment handler for PHP projects (including unit tests!)

When writing PHP projects that are more complicated than a two-page site, you're going to run into some real life problems:

• Am I in development or production?

  E.g., during development a mailer should not actually send out mails to users, but instead proxy to the developer.

• What are the correct database credentials for this environment?

  Ideally, the same as production, but alas 'tis not an ideal world we live in.

• What are safe fallbacks for e.q. $_SERVER values when running from the command line?

  Since things like $_SERVER['SERVER_NAME'] will also be different in development than they are in production.

• During testing, what should we use now?

  Obviously we don't want to test against a production database.

• How can I test a multi-project setup using one set of unit tests?

  PHPUnit and DBUnit are great, but they kinda assume a single database. For complex projects, this is often simply not the case. Also, multiple sites might be related and thus share 99% percent of unit tests. Since copy/paste is evil, it would be nice to have a way to automatically decide which database(s) a set of tests needs to run against.

Installation

Composer (recommended)

Manual

1. Download or clone the repository;
2. Add /path/to/envy/src for the namespace Monolyth\\Envy\\ to your autoloader.

Usage

As of version 0.7, Envy works exclusively on .env files, since that seems to be the industry standard. We do still, however, support some extensions.

To construct your environment (somewhere centrally), instantiate an object of the Monolyth\Envy\Environment class. It takes two parameters: the path to your environment configuration files, and a hash where the keys are environment names and the values are either booleans or callables returning a boolean. Any environment that is or resolves to false will be skipped. Hence, you could do something like this:

After initial instantiation you can either use dependency injection to access the environment, or you the static Environment::instance() method.

You can define as many environments as you want, since multiple can be valid at any given time. E.g. both prod and web or prod and cli.

Keep in mind that existing keys will be overwritten by subsequent environments defining the same key.

Configuration file naming

We're using .env format, so configuration files should be called either .env (for "generic" or "global" variables, the environment '' in other words) or alternatively .env.ENVIRONMENT_NAME. Note that these should not be included in your VCS! That's the whole idea of .env files. The only exception is a .env.example file with dummy values, but which gives other users a comprehensive list of stuff they would want to set.

Checking for environments

You'll often want to check for environments. All defined environments will be available on the $environment object as true, else false. So you can do something like the following:

Using defined environment variables

Like the environments themselves, variables are available as properties on the environment object, or will be false if undefined.

Usually (not sure if by convention or as an actual requirement...) environment variables are in UPPERCASE. This is ugly in PHP. Hence, all variables are lowercased for your convenience:

Custom feature: JSON support

For any value that can be json_decoded, its actual decoded value is used instead.

Custom feature: underscore object expansion

Okay, that's a crappy name. What this means is that for any variable names containing underscores, they are actually treated as "namespaces" and stored under sub-environments. Consider the following:

This would work, but is annoying. Envy automagically turns this into:

This works for as many levels of nesting as you'd need.

Placeholders

Default .env placeholders are supported, e.g.:

Gotchas and caveats

• Do not give environments names that are also used as variables. Variables take precendence, so the results won't be what you expect.
• Similar for "underscore expanded" objects and JSON. Depending on the order it might produce a sort-of working result, but it's probably not going to be what you want. Just take care here; either use JSON or expansion, but don't mix and match.

Note, however, the following is not a problem:

...since the JSON parsing won't be done until after the underscores have been expanded.

Differences from other DOTENV loaders

• Envy supports JSON and "underscore expansion" for your convenience;
• Envy supports multiple environments based on conditions, e.g. you can have .env.dev, .env.cli and .env.test in the same folder and decide at run time which one(s) is/are applicable;
• Envy supports the ->$environment check so your code can also do different things based on the environment(s) loaded. E.g. during tests you may want to load certains mocks instead of your regular dependencies, and during development you don't want to send mails to actual users, but just to the developer in question for review.