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+<?php

+

+namespace Telnyx\Util;

+

+use ArrayAccess;

+

+/**

+ * CaseInsensitiveArray is an array-like class that ignores case for keys.

+ *

+ * It is used to store HTTP headers. Per RFC 2616, section 4.2:

+ * Each header field consists of a name followed by a colon (":") and the field value. Field names

+ * are case-insensitive.

+ *

+ * In the context of telnyx-php, this is useful because the API will return headers with different

+ * case depending on whether HTTP/2 is used or not (with HTTP/2, headers are always in lowercase).

+ */

+class CaseInsensitiveArray implements ArrayAccess

+{

+    private $container = array();

+

+    public function __construct($initial_array = array())

+    {

+        $this->container = array_map("strtolower", $initial_array);

+    }

+

+    public function offsetSet($offset, $value)

+    {

+        $offset = static::maybeLowercase($offset);

+        if (is_null($offset)) {

+            $this->container[] = $value;

+        } else {

+            $this->container[$offset] = $value;

+        }

+    }

+

+    public function offsetExists($offset)

+    {

+        $offset = static::maybeLowercase($offset);

+        return isset($this->container[$offset]);

+    }

+

+    public function offsetUnset($offset)

+    {

+        $offset = static::maybeLowercase($offset);

+        unset($this->container[$offset]);

+    }

+

+    public function offsetGet($offset)

+    {

+        $offset = static::maybeLowercase($offset);

+        return isset($this->container[$offset]) ? $this->container[$offset] : null;

+    }

+

+    private static function maybeLowercase($v)

+    {

+        if (is_string($v)) {

+            return strtolower($v);

+        } else {

+            return $v;

+        }

+    }

+}