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File: CaseInsensitiveArray.php
<?php namespace Stripe\Util; /** * 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 stripe-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; } }