diff --git a/.phan/config.php b/.phan/config.php
index a06886d..6e1366f 100644
--- a/.phan/config.php
+++ b/.phan/config.php
@@ -78,7 +78,8 @@ return [
     // to parse, but not analyze
     "exclude_analysis_directory_list" => [
         'vendor',
-        'test'
+        'test',
+        'tmp'
     ],
     'exclude_file_list' => [
     ],
diff --git a/Readme.md b/Readme.md
index 56a498f..a3ca819 100644
--- a/Readme.md
+++ b/Readme.md
@@ -61,6 +61,29 @@ DOUBLE="I will be used"
 DOUBLE="This will be ignored"
 ```
 
+A prefix name can be set with `[PrefixName]`. Tne name rules are like for variables, but spaces
+are allowed, but will be converted to "_".
+The prefix is valid from the time set until the next prefix block appears or the file ends.
+
+Example
+
+```ini
+FOO="bar"
+FOOBAR="bar bar"
+[SecitonA]
+FOO="other bar"
+FOOBAR="other bar bar"
+```
+
+Will have environmen variables as
+
+```php
+$_ENV["FOO"];
+$_ENV["FOOBAR"];
+$_ENV["SecitonA.FOO"];
+$_ENV["SecitonA.FOOBAR"];
+```
+
 ## Development
 
 ### Phan
diff --git a/src/DotEnv.php b/src/DotEnv.php
index 6dd878c..01868f8 100644
--- a/src/DotEnv.php
+++ b/src/DotEnv.php
@@ -22,6 +22,9 @@ class DotEnv
      * if there are two variables with the same name only the first is used
      * variables are case sensitive
      *
+     * [] Grouping Block Name as prefix until next or end if set,
+     * space replaced by _, all other var rules apply
+     *
      * @param  string $path     Folder to file, default is __DIR__
      * @param  string $env_file What file to load, default is .env
      * @return int              -1 other error
@@ -56,10 +59,14 @@ class DotEnv
         $status = 1;
         $block = false;
         $var = '';
+        $prefix_name = '';
         while ($line = fgets($fp)) {
-            // main match for variable = value part
-            if (preg_match("/^\s*([\w_.]+)\s*=\s*((\"?).*)/", $line, $matches)) {
-                $var = $matches[1];
+            // [] block must be a single line, or it will be ignored
+            if (preg_match("/^\s*\[([\w_.\s]+)\]/", $line, $matches)) {
+                $prefix_name = preg_replace("/\s+/", "_", $matches[1]) . ".";
+            } elseif (preg_match("/^\s*([\w_.]+)\s*=\s*((\"?).*)/", $line, $matches)) {
+                // main match for variable = value part
+                $var = $prefix_name . $matches[1];
                 $value = $matches[2];
                 $quotes = $matches[3];
                 // write only if env is not set yet, and write only the first time
diff --git a/test/phpUnitTests/DotEnvTest.php b/test/phpUnitTests/DotEnvTest.php
index 77d4385..ecb01df 100644
--- a/test/phpUnitTests/DotEnvTest.php
+++ b/test/phpUnitTests/DotEnvTest.php
@@ -60,6 +60,8 @@ final class DotEnvTest extends TestCase
             'HAS_COMMENT_NO_QUOTES_SPACE' => 'Comment at end no quotes and space',
             'HAS_COMMENT_NO_QUOTES_NO_SPACE' => 'Comment at end no quotes no space',
             'COMMENT_IN_TEXT_QUOTES' => 'Foo bar # comment in here',
+            'HAS_EQUAL_NO_QUITES' => 'Is This = Valid',
+            'HAS_EQUAL_QUITES' => 'Is This = Valid',
             'FAILURE' => 'ABC',
             'SIMPLEBOX' => 'A B  C',
             'TITLE' => '1',
@@ -87,6 +89,8 @@ final class DotEnvTest extends TestCase
             '__FOOFOO' => 'f     ',
             123123 => 'number',
             'EMPTY' => '',
+            'Var_Test.TEST' => 'Block 1 D',
+            'OtherSet.TEST' => 'Block 2 D',
         ];
         // 0: folder relative to test folder, if unset __DIR__
         // 1: file, if unset .env
diff --git a/test/phpUnitTests/dotenv/test.env b/test/phpUnitTests/dotenv/test.env
index 46d3456..d0e9421 100644
--- a/test/phpUnitTests/dotenv/test.env
+++ b/test/phpUnitTests/dotenv/test.env
@@ -10,6 +10,8 @@ HAS_COMMENT_QUOTES_NO_SPACE="Comment at end with quotes no space"# Comment QES
 HAS_COMMENT_NO_QUOTES_SPACE=Comment at end no quotes and space # Comment NQE
 HAS_COMMENT_NO_QUOTES_NO_SPACE=Comment at end no quotes no space# Comment NQES
 COMMENT_IN_TEXT_QUOTES="Foo bar # comment in here"
+HAS_EQUAL_NO_QUITES=Is This = Valid
+HAS_EQUAL_QUITES="Is This = Valid"
 FAILURE = ABC
 SIMPLEBOX= A B  C
 TITLE=1
@@ -47,3 +49,10 @@ SUPERLINE=
 EMPTY=
 = flase
 asfasdf
+# BLOCK TESTS
+[Var Test]
+TEST="Block 1 D"
+[OtherSet]
+TEST="Block 2 D"
+[Ignore-Invalid-Block]
+TEST="Block 3 D"