Added PHP and Lua

lua.lua

@@ -0,0 +1,14 @@
+function add(x)
+    return function(y)
+        return x+y
+    end
+end
+
+function each(list, callback)
+    for item in pairs(list) do
+        callback(item)
+    end
+end
+
+print(add(1)(2))
+each({1,2,3}, print)

php.php

@@ -0,0 +1,24 @@
+<?php
+
+// Returns a function
+function add($x){
+    return function($y) use($x){
+        return $x + $y;
+    };
+}
+
+// Takes a callback function
+function _each($items, $callback){
+    foreach ($items as $item){
+        $callback($item);
+    }
+}
+
+// Example of calling the functions
+
+print(add(1)(2) . "\n");
+
+function my_callback($v){
+    echo $v;
+}
+_each(array(1,2,3), 'my_callback');