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<?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);
}
#[\ReturnTypeWillChange]
public function count()
{
return \count($this->container);
}
/**
* @return \ArrayIterator
*/
#[\ReturnTypeWillChange]
public function getIterator()
{
return new \ArrayIterator($this->container);
}
/**
* @return void
*/
#[\ReturnTypeWillChange]
public function offsetSet($offset, $value)
{
$offset = static::maybeLowercase($offset);
if (null === $offset) {
$this->container[] = $value;
} else {
$this->container[$offset] = $value;
}
}
/**
* @return bool
*/
#[\ReturnTypeWillChange]
public function offsetExists($offset)
{
$offset = static::maybeLowercase($offset);
return isset($this->container[$offset]);
}
/**
* @return void
*/
#[\ReturnTypeWillChange]
public function offsetUnset($offset)
{
$offset = static::maybeLowercase($offset);
unset($this->container[$offset]);
}
/**
* @return mixed
*/
#[\ReturnTypeWillChange]
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;
}
}
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