[Php71] Skip static or global on CountOnNullRector (#1742)

* [Php71] Skip static or global on CountOnNullRector

* Fixed 🎉

rules-tests/Php71/Rector/FuncCall/CountOnNullRector/Fixture/skip_global.php.inc

@@ -0,0 +1,14 @@
+<?php
+
+namespace Rector\Tests\Php71\Rector\FuncCall\CountOnNullRector\Fixture;
+
+$data = ['test'];
+
+class SkipGlobal
+{
+    public function run()
+    {
+        global $data;
+        echo count($data);
+    }
+}

rules-tests/Php71/Rector/FuncCall/CountOnNullRector/Fixture/skip_static.php.inc

@@ -0,0 +1,12 @@
+<?php
+
+namespace Rector\Tests\Php71\Rector\FuncCall\CountOnNullRector\Fixture;
+
+class SkipStatic
+{
+    public function run()
+    {
+        static $data = [];
+        echo count($data);
+    }
+}

rules/Php71/Rector/FuncCall/CountOnNullRector.php

@@ -14,6 +14,7 @@
 use PhpParser\Node\Expr\FuncCall;
 use PhpParser\Node\Expr\Instanceof_;
 use PhpParser\Node\Expr\Ternary;
+use PhpParser\Node\Expr\Variable;
 use PhpParser\Node\Name;
 use PhpParser\Node\Name\FullyQualified;
 use PhpParser\Node\Scalar\LNumber;
@@ -22,6 +23,7 @@
 use PHPStan\Type\NullType;
 use PHPStan\Type\Type;
 use PHPStan\Type\UnionType;
+use Rector\Core\NodeAnalyzer\VariableAnalyzer;
 use Rector\Core\Rector\AbstractRector;
 use Rector\Core\ValueObject\PhpVersionFeature;
 use Rector\NodeTypeResolver\Node\AttributeKey;
@@ -45,7 +47,8 @@ final class CountOnNullRector extends AbstractRector implements MinPhpVersionInt
 
     public function __construct(
         private readonly CountableTypeAnalyzer $countableTypeAnalyzer,
-        private readonly CountableAnalyzer $countableAnalyzer
+        private readonly CountableAnalyzer $countableAnalyzer,
+        private readonly VariableAnalyzer $variableAnalyzer
     ) {
     }
 
@@ -193,7 +196,15 @@ private function shouldSkip(FuncCall $funcCall): bool
 
         // skip node in trait, as impossible to analyse
         $trait = $this->betterNodeFinder->findParentType($funcCall, Trait_::class);
-        return $trait instanceof Trait_;
+        if ($trait instanceof Trait_) {
+            return true;
+        }
+
+        if (! $funcCall->args[0]->value instanceof Variable) {
+            return false;
+        }
+
+        return $this->variableAnalyzer->isStaticOrGlobal($funcCall->args[0]->value);
     }
 
     private function castToArray(Expr $countedExpr, FuncCall $funcCall): FuncCall