feat: add basic Underscore layout

Author: adhocore

src/Underscore.php

@@ -0,0 +1,103 @@
+<?php
+
+namespace Ahc\Underscore;
+
+class Underscore implements \ArrayAccess, \Countable, \IteratorAggregate, \JsonSerializable
+{
+    const VERSION = '0.0.1';
+
+    /** @var array The array manipulated by this object */
+    protected $data;
+
+    /**
+     * Constructor.
+     *
+     * @param array|mixed $data.
+     */
+    public function __construct($data = [])
+    {
+        $this->data = is_array($data) ? $data : Helper::asArray($data);
+    }
+
+    /**
+     * Get the underlying array data.
+     *
+     * @param string|int|null $index
+     *
+     * @return mixed
+     */
+    public function get($index = null)
+    {
+        if (null === $index) {
+            return $this->data;
+        }
+
+        return $this->data[$index];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function offsetExists($index)
+    {
+        return \array_key_exists($index, $this->data);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function offsetGet($index)
+    {
+        return $this->data[$index];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function offsetSet($index, $value)
+    {
+        $this->data[$index] = $value;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function offsetUnset($index)
+    {
+        unset($this->data[$index]);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function count()
+    {
+        return \count($this->data);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getIterator()
+    {
+        return new \ArrayIterator($this->data);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function jsonSerialize()
+    {
+        return $this->data;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __toString()
+    {
+        return \json_encode($this->data);
+    }
+}
+
+\class_alias('Ahc\Underscore\Underscore', 'Ahc\Underscore');