Fix PHPStan errors.

Author: drupol

spec/drupol/phptree/Node/ValueNodeSpec.php

@@ -4,7 +4,6 @@
 
 namespace spec\drupol\phptree\Node;
 
-use drupol\phptree\Node\Node;
 use drupol\phptree\Node\ValueNode;
 
 class ValueNodeSpec extends NodeObjectBehavior
@@ -76,20 +75,6 @@ public function it_can_have_children()
         $this->shouldHaveSameGraph($tree);
     }
 
-    public function it_is_initializable()
-    {
-        $this
-            ->beConstructedWith('root');
-
-        $this->shouldHaveType(ValueNode::class);
-
-        $this->children()->shouldYield(new \ArrayIterator([]));
-
-        $export = '[root]';
-        $this->shouldHaveSameTextExport($export);
-    }
-
-
     public function it_can_remove()
     {
         $this
@@ -104,7 +89,6 @@ public function it_can_remove()
 
         $this->shouldHaveSameTextExport('[root [A] [B]]');
 
-
         $this
             ->remove($node2);
 
@@ -125,4 +109,16 @@ public function it_can_remove()
             ->shouldReturn(0);
     }
 
+    public function it_is_initializable()
+    {
+        $this
+            ->beConstructedWith('root');
+
+        $this->shouldHaveType(ValueNode::class);
+
+        $this->children()->shouldYield(new \ArrayIterator([]));
+
+        $export = '[root]';
+        $this->shouldHaveSameTextExport($export);
+    }
 }

src/Importer/Text.php

@@ -55,7 +55,11 @@ private function parse(string $subject)
 
         \preg_match_all('~[^\[\]]+|\[(?<nested>(?R)*)\]~', $subject, $matches);
 
-        foreach (\array_filter($matches['nested']) as $match) {
+        if (null === $matches = \array_filter($matches['nested'])) {
+            $matches = [];
+        }
+
+        foreach ($matches as $match) {
             $item = [];
             $position = \strpos($match, '[');