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<?php
namespace Stripe\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 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
{
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;
}
}
}