Start of factor graph port. Things don't work yet, but a lot of syntax updates towards PHP

PHPSkills/FactorGraphs/VariableFactory.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Moserware\Skills\FactorGraphs;
+
+class VariableFactory
+{
+    // using a Func<TValue> to encourage fresh copies in case it's overwritten
+    private $_variablePriorInitializer;
+
+    public function __construct($variablePriorInitializer)
+    {
+        $this->_variablePriorInitializer = $variablePriorInitializer;
+    }
+
+    public function createBasicVariable()
+    {
+        $newVar = new Variable($this->_variablePriorInitializer());
+        return $newVar;
+    }
+
+    public function createKeyedVariable($key)
+    {
+        $newVar = new KeyedVariable($key, $this->_variablePriorInitializer());
+        return $newVar;
+    }
+}s
+
+?>