README.md

@@ -117,7 +117,7 @@ $s3_bucket = $_SERVER['S3_BUCKET'];
 
 ### Putenv and Getenv
 
-Using `getenv()` and `putenv()` is strongly discurraged due to the fact that
+Using `getenv()` and `putenv()` is strongly discouraged due to the fact that
 these functions are not thread safe, however it is still possible to instruct
 PHP dotenv to use these functions. Instead of calling
 `Dotenv::createImmutable`, one can call `Dotenv::createUnsafeImmutable`, which

composer.json

@@ -47,7 +47,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "5.1-dev"
+            "dev-master": "5.2-dev"
         }
     }
 }

src/Repository/Adapter/EnvConstAdapter.php

@@ -40,9 +40,20 @@ public static function create()
     public function read(string $name)
     {
         /** @var \PhpOption\Option<string> */
-        return Option::fromArraysValue($_ENV, $name)->filter(static function ($value) {
-            return \is_string($value);
-        });
+        return Option::fromArraysValue($_ENV, $name)
+            ->map(static function ($value) {
+                if ($value === false) {
+                    return 'false';
+                }
+
+                if ($value === true) {
+                    return 'true';
+                }
+
+                return $value;
+            })->filter(static function ($value) {
+                return \is_string($value);
+            });
     }
 
     /**

src/Repository/Adapter/ServerConstAdapter.php

@@ -40,9 +40,20 @@ public static function create()
     public function read(string $name)
     {
         /** @var \PhpOption\Option<string> */
-        return Option::fromArraysValue($_SERVER, $name)->filter(static function ($value) {
-            return \is_string($value);
-        });
+        return Option::fromArraysValue($_SERVER, $name)
+            ->map(static function ($value) {
+                if ($value === false) {
+                    return 'false';
+                }
+
+                if ($value === true) {
+                    return 'true';
+                }
+
+                return $value;
+            })->filter(static function ($value) {
+                return \is_string($value);
+            });
     }
 
     /**

tests/Dotenv/Repository/Adapter/EnvConstAdapterTest.php

@@ -17,6 +17,22 @@ public function testGoodRead()
         self::assertSame('foo bar baz', $value->get());
     }
 
+    public function testFalseRead()
+    {
+        $_ENV['CONST_TEST'] = false;
+        $value = self::createAdapter()->read('CONST_TEST');
+        self::assertTrue($value->isDefined());
+        self::assertSame('false', $value->get());
+    }
+
+    public function testTrueRead()
+    {
+        $_ENV['CONST_TEST'] = true;
+        $value = self::createAdapter()->read('CONST_TEST');
+        self::assertTrue($value->isDefined());
+        self::assertSame('true', $value->get());
+    }
+
     public function testBadTypeRead()
     {
         $_ENV['CONST_TEST'] = 123;

tests/Dotenv/Repository/Adapter/ServerConstAdapterTest.php

@@ -17,6 +17,22 @@ public function testGoodRead()
         self::assertSame('foo bar baz', $value->get());
     }
 
+    public function testFalseRead()
+    {
+        $_SERVER['CONST_TEST'] = false;
+        $value = self::createAdapter()->read('CONST_TEST');
+        self::assertTrue($value->isDefined());
+        self::assertSame('false', $value->get());
+    }
+
+    public function testTrueRead()
+    {
+        $_SERVER['CONST_TEST'] = true;
+        $value = self::createAdapter()->read('CONST_TEST');
+        self::assertTrue($value->isDefined());
+        self::assertSame('true', $value->get());
+    }
+
     public function testBadTypeRead()
     {
         $_SERVER['CONST_TEST'] = 123;