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

HashMap.php

@@ -0,0 +1,46 @@
+<?php
+
+class HashMap
+{
+    private $_hashToValue = array();
+    private $_hashToKey = array();
+
+    public function getValue($key)
+    {
+        return $this->_hashToValue[self::getHash($key)];
+    }
+
+    public function setValue($key, $value)
+    {
+        $hash = self::getHash($key);
+        $this->_hashToKey[$hash] = $key;
+        $this->_hashToValue[$hash] = $value;
+        return $this;
+    }
+
+    public function getAllKeys()
+    {
+        return \array_values($this->_hashToKey);
+    }
+
+    public function getAllValues()
+    {
+        return \array_values($this->_hashToValue);
+    }
+
+    public function count()
+    {
+        return \count($this->_hashToKey);
+    }
+
+    private static function getHash($key)
+    {
+        if(\is_object($key))
+        {
+            return \spl_object_hash($key);
+        }
+
+        return $key;
+    }
+}
+?>