functions and classes added.

src/Post.php

@@ -0,0 +1,25 @@
+<?php
+
+class Post {
+    private $data = [];
+
+    public function __construct($post) {
+        $this->sanitize($post);
+    }
+
+    private function sanitize($post) {
+        foreach ($post as $key => $value) {
+            $this->data[$key] = is_array($value) 
+                ? filter_var_array($value, FILTER_SANITIZE_FULL_SPECIAL_CHARS) 
+                : filter_var($value, FILTER_SANITIZE_FULL_SPECIAL_CHARS);
+        }
+    }
+
+    public function get($key, $default = null) {
+        return $this->data[$key] ?? $default;
+    }
+
+    public function all() {
+        return $this->data;
+    }
+}