new file mode 100644

@@ -0,0 +1,74 @@

+<?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, \Countable, \IteratorAggregate

+{

+    private $container = [];

+

+    public function __construct($initial_array = [])

+    {

+        $this->container = \array_change_key_case($initial_array, \CASE_LOWER);

+    }

+

+    public function count()

+    {

+        return \count($this->container);

+    }

+

+    public function getIterator()

+    {

+        return new \ArrayIterator($this->container);

+    }

+

+    public function offsetSet($offset, $value)

+    {

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

+        if (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);

+        }

+

+        return $v;

+    }

+}