Added SymfonyDotenvProvider.

Author: ChrisLightfootWild

src/Config/SDK/Configuration/Environment/Adapter/SymfonyDotenvProvider.php

@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\Config\SDK\Configuration\Environment\Adapter;
+
+use Composer\InstalledVersions;
+use Dotenv\Dotenv;
+use Nevay\SPI\ServiceProviderDependency\PackageDependency;
+use OpenTelemetry\Config\SDK\Configuration\Environment\ArrayEnvSource;
+use OpenTelemetry\Config\SDK\Configuration\Environment\EnvSource;
+use OpenTelemetry\Config\SDK\Configuration\Environment\EnvSourceProvider;
+use Symfony\Component\Dotenv\Dotenv;
+use Symfony\Component\Dotenv\Exception\PathException;
+use function array_diff_key;
+
+#[PackageDependency('symfony/dotenv', '^5.4 || ^6.4 || ^7.0')]
+final class SymfonyDotenvProvider implements EnvSourceProvider {
+
+    public function getEnvSource(): EnvSource {
+        $installPath = InstalledVersions::getRootPackage()['install_path'];
+
+        $backup = [$_SERVER, $_ENV];
+        $env = [];
+
+        try {
+            (new Dotenv())->bootEnv($installPath . '/.env');
+            $env = $_SERVER;
+        } catch (PathException) {
+        } finally {
+            [$_SERVER, $_ENV] = $backup;
+        }
+
+        return new ArrayEnvSource(array_diff_key($env, $_SERVER));
+    }
+}