From 6ae3e2e6494bb5e58c2decadafc3de7f1453f70a Mon Sep 17 00:00:00 2001
From: Jean-Christophe Lebreton <jclebreton@gmail.com>
Date: Sun, 1 Jul 2018 12:25:50 +0200
Subject: [PATCH] Added the list of environment variable declared inside the
 'env' file (#199)

---
 src/Dotenv.php              | 10 ++++++++++
 src/Loader.php              |  9 +++++++++
 tests/Dotenv/DotenvTest.php |  8 ++++++++
 tests/Dotenv/LoaderTest.php |  5 +++++
 4 files changed, 32 insertions(+)

diff --git a/src/Dotenv.php b/src/Dotenv.php
index d32c7384..22fc0f18 100644
--- a/src/Dotenv.php
+++ b/src/Dotenv.php
@@ -117,4 +117,14 @@ public function required($variable)
     {
         return new Validator((array) $variable, $this->loader);
     }
+
+    /**
+     * Get the list of environment variables declared inside the 'env' file.
+     *
+     * @return array
+     */
+    public function getEnvironmentVariableNames()
+    {
+        return $this->loader->variableNames;
+    }
 }
diff --git a/src/Loader.php b/src/Loader.php
index 9aa0e288..327302db 100644
--- a/src/Loader.php
+++ b/src/Loader.php
@@ -28,6 +28,13 @@ class Loader
      */
     protected $immutable;
 
+    /**
+     * The list of environment variables declared inside the 'env' file.
+     *
+     * @var array
+     */
+    public $variableNames = array();
+
     /**
      * Create a new loader instance.
      *
@@ -357,6 +364,8 @@ public function setEnvironmentVariable($name, $value = null)
     {
         list($name, $value) = $this->normaliseEnvironmentVariable($name, $value);
 
+        $this->variableNames[] = $name;
+
         // Don't overwrite existing environment variables if we're immutable
         // Ruby's dotenv does this with `ENV[key] ||= value`.
         if ($this->immutable && $this->getEnvironmentVariable($name) !== null) {
diff --git a/tests/Dotenv/DotenvTest.php b/tests/Dotenv/DotenvTest.php
index daed85db..2e972945 100644
--- a/tests/Dotenv/DotenvTest.php
+++ b/tests/Dotenv/DotenvTest.php
@@ -336,4 +336,12 @@ public function testDotenvRequiredCanBeUsedWithoutLoadingFile()
         $dotenv->required('REQUIRED_VAR')->notEmpty();
         $this->assertTrue(true);
     }
+
+    public function testGetEnvironmentVariablesList()
+    {
+        $dotenv = new Dotenv($this->fixturesFolder);
+        $dotenv->load();
+        $this->assertTrue(is_array($dotenv->getEnvironmentVariableNames()));
+        $this->assertSame(array('FOO', 'BAR', 'SPACED', 'NULL'), $dotenv->getEnvironmentVariableNames());
+    }
 }
diff --git a/tests/Dotenv/LoaderTest.php b/tests/Dotenv/LoaderTest.php
index ee8b93d0..3915b2b1 100644
--- a/tests/Dotenv/LoaderTest.php
+++ b/tests/Dotenv/LoaderTest.php
@@ -97,6 +97,9 @@ public function testMutableLoaderClearsEnvironmentVars()
         $this->assertSame(false, getenv($this->key()));
         $this->assertSame(false, isset($_ENV[$this->key()]));
         $this->assertSame(false, isset($_SERVER[$this->key()]));
+        $this->assertTrue(is_array($this->mutableLoader->variableNames));
+        $this->assertFalse(empty($this->mutableLoader->variableNames));
+
     }
 
     public function testImmutableLoaderSetUnsetImmutable()
@@ -121,5 +124,7 @@ public function testImmutableLoaderCannotClearEnvironmentVars()
         $this->assertSame($this->value(), getenv($this->key()));
         $this->assertSame(true, isset($_ENV[$this->key()]));
         $this->assertSame(true, isset($_SERVER[$this->key()]));
+        $this->assertTrue(is_array($this->immutableLoader->variableNames));
+        $this->assertFalse(empty($this->immutableLoader->variableNames));
     }
 }