Account for PHP case-insensitiveness (#118)

specs/misc.php

@@ -41,4 +41,41 @@
 
 PHP
     ,
+
+    [
+        'spec' => <<<'SPEC'
+When resolving fully qualified class names, keep in mind that classes are case insensitive in PHP.
+SPEC
+        ,
+        'payload' => <<<'PHP'
+<?php
+
+namespace Foo {
+    class X {}
+}
+
+namespace {
+    use FOO\x as Y;
+    use Foo\stdClass;
+    
+    var_dump(new y());
+    var_dump(new STDCLASS());
+}
+----
+<?php
+
+namespace Humbug\Foo {
+    class X
+    {
+    }
+}
+namespace {
+    use Humbug\FOO\x as Y;
+    use Humbug\Foo\stdClass;
+    \var_dump(new \Humbug\FOO\x());
+    \var_dump(new \Humbug\Foo\stdClass());
+}
+
+PHP
+    ],
 ];

src/NodeVisitor/Collection/UseStmtCollection.php

@@ -57,24 +57,19 @@ public function add(?Name $namespaceName, Use_ $node): void
      */
     public function findStatementForNode(?Name $namespaceName, Name $node): ?Name
     {
-        $name = $node->getFirst();
+        $name = strtolower($node->getFirst());
 
         $useStatements = $this->nodes[(string) $namespaceName] ?? [];
 
         foreach ($useStatements as $use_) {
             foreach ($use_->uses as $useStatement) {
                 if ($useStatement instanceof UseUse) {
-                    if ($name === $useStatement->alias) {
+                    if ($name === strtolower($useStatement->alias)) {
                         // Match the alias
                         return $useStatement->name;
                     } elseif (null !== $useStatement->alias) {
                         continue;
                     }
-
-                    if ($name === $useStatement->name->getLast() && $useStatement->alias === null) {
-                        // Match a simple use statement
-                        return $useStatement->name;
-                    }
                 }
             }
         }