README

CustomEnvironmentVariables is inspired by node-config's Custom Environment Variables feature.

Requirements

PHP 7.1+

Installation

$ composer require wfs/custom-environment-variables

Usage

Example code usage.php is:

<?php
require __DIR__ . '/vendor/autoload.php';

use Wfs\CustomEnvironmentVariables\Customizer;

$customizer = new Customizer([
    'employee' => [
        'name' => 'NAME',
        'age' => 'AGE',
    ]
]);

$target = [
    'employee' => [
        'name' => 'alice',
        'age' => '10',
    ]
];

$customized = $customizer->customize($target);

echo("name: {$customized['employee']['name']}" . PHP_EOL);
echo("age: {$customized['employee']['age']}" . PHP_EOL);

If you does not set any environment variables, usage.php result is:

$ php usage.php
name: alice
age: 10

If you set NAME, usage.php result is:

$ export NAME=bob
$ php usage.php
name: bob
age: 10

If you set NAME and AGE, usage.php result is:

$ export NAME=bob
$ export AGE=20
$ php usage.php
name: bob
age: 20

You will use CustomEnvironmentVariables with Config.

Example code config.php is:

<?php
require __DIR__ . '/vendor/autoload.php';

use Wfs\CustomEnvironmentVariables\Customizer;
use Noodlehaus\Config;
use Noodlehaus\Parser\Yaml;

$customizer = new Customizer([
    'employee' => [
        'name' => 'NAME',
        'age' => 'AGE',
    ]
]);

$target = new Config(<<<CONF
employee:
  name: alice
  age: '10' # must be string
CONF
, new Yaml, true);

echo("name: {$target['employee']['name']}" . PHP_EOL);
echo("age: {$target['employee']['age']}" . PHP_EOL);

$customized = $customizer->customize($target);

echo("name: {$customized['employee']['name']}" . PHP_EOL);
echo("age: {$customized['employee']['age']}" . PHP_EOL);

result is:

$ export NAME=bob
$ export AGE=20
$ php config.php
name: alice
age: 10
name: bob
age: 20