Add Composer autoloading functions and PHPStan for testing

vendor/nikic/php-parser/test/code/parser/scalar/magicConst.test

@@ -0,0 +1,47 @@
+Magic constants
+-----
+<?php
+
+__CLASS__;
+__DIR__;
+__FILE__;
+__FUNCTION__;
+__LINE__;
+__METHOD__;
+__NAMESPACE__;
+__TRAIT__;
+-----
+array(
+    0: Stmt_Expression(
+        expr: Scalar_MagicConst_Class(
+        )
+    )
+    1: Stmt_Expression(
+        expr: Scalar_MagicConst_Dir(
+        )
+    )
+    2: Stmt_Expression(
+        expr: Scalar_MagicConst_File(
+        )
+    )
+    3: Stmt_Expression(
+        expr: Scalar_MagicConst_Function(
+        )
+    )
+    4: Stmt_Expression(
+        expr: Scalar_MagicConst_Line(
+        )
+    )
+    5: Stmt_Expression(
+        expr: Scalar_MagicConst_Method(
+        )
+    )
+    6: Stmt_Expression(
+        expr: Scalar_MagicConst_Namespace(
+        )
+    )
+    7: Stmt_Expression(
+        expr: Scalar_MagicConst_Trait(
+        )
+    )
+)