Do not append separator to initial prefix

Author: Alaa Sarhan

src/Flatten.php

@@ -15,7 +15,7 @@ class Flatten
      * 
      * Non-traversable values will be returned as-is, after being put into the final array with the fully-qualified key.
      * 
-     * An initial prefix can be optionally to namespace all returned keys using that prefix.
+     * An initial prefix can be optionally provided, but it will not separated using the separator.
      * 
      * @param mixed $var
      * @param string $separator
@@ -25,8 +25,8 @@ class Flatten
     public static function flatten($var, $separator = '.', $prefix = '')
     {
         $flattened = [];
-        foreach (self::flattenGenerator($var, $separator, $prefix) as $key => $value) {
-            $flattened[$key] = $value;
+        foreach (self::flattenGenerator($var, $separator, '') as $key => $value) {
+            $flattened[$prefix . $key] = $value;
         }
         return $flattened;
     }
@@ -36,7 +36,7 @@ private static function flattenGenerator($var, $separator, $prefix = '')
         if (self::canTraverse($var)) {
             $prefix .= (empty($prefix) ? '' : $separator);
             foreach ($var as $key => $value) {
-                foreach (self::flattenGenerator($value, $separator, $prefix . $key) as $k => $v) {
+                foreach (self::flattenGenerator($value, $separator, $prefix .$key) as $k => $v) {
                     yield $k => $v;
                 }
             }

test/FlattenTest.php

@@ -117,19 +117,19 @@ public function testFlattenTraversable($input, $expectedOutput)
     public function traversablesSeparatorPrefixProvider()
     {
         return [
-            [ new \ArrayIterator([ ]), '-', 'global', [ ] ],
-            [ new \ArrayIterator([ 0 ]), '-', 'global', [ 'global-0' => 0 ] ],
-            [ new \ArrayIterator([ 1, 2 ]), '-', 'global', [ 'global-0' => 1, 'global-1' => 2 ] ],
+            [ new \ArrayIterator([ ]), '-', 'global-', [ ] ],
+            [ new \ArrayIterator([ 0 ]), '-', 'global-', [ 'global-0' => 0 ] ],
+            [ new \ArrayIterator([ 1, 2 ]), '-', 'global-', [ 'global-0' => 1, 'global-1' => 2 ] ],
             [
                 new \ArrayIterator([ 1, 2, [ 3, 4 ] ]),
                 '-',
-                'global',
+                'global-',
                 [ 'global-0' => 1, 'global-1' => 2, 'global-2-0' => 3, 'global-2-1' => 4 ]
             ],
             [
                 new \ArrayIterator([ 'a' => 1, 2, 'b' => new \ArrayIterator([ 3, 'c' => 4 ]) ]),
                 '/',
-                'local',
+                'local/',
                 [ 'local/a' => 1, 'local/0' => 2, 'local/b/0' => 3, 'local/b/c' => 4 ]
             ],
             [