Developer
<?php
declare(strict_types=1);
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface;
/**
* Reads from multiple streams, one after the other.
*
* This is a read-only stream decorator.
*/
final class AppendStream implements StreamInterface
{
/** @var StreamInterface[] Streams being decorated */
private $streams = [];
/** @var bool */
private $seekable = true;
/** @var int */
private $current = 0;
/** @var int */
private $pos = 0;
/**
* @param StreamInterface[] $streams Streams to decorate. Each stream must
* be readable.
*/
public function __construct(array $streams = [])
{
foreach ($streams as $stream) {
$this->addStream($stream);
}
}
public function __toString(): string
{
try {
$this->rewind();
return $this->getContents();
} catch (\Throwable $e) {
if (\PHP_VERSION_ID >= 70400) {
throw $e;
}
trigger_error(sprintf('%s::__toString exception: %s', self::class, (string) $e), E_USER_ERROR);
return '';
}
}
/**
* Add a stream to the AppendStream
*
* @param StreamInterface $stream Stream to append. Must be readable.
*
* @throws \InvalidArgumentException if the stream is not readable
*/
public function addStream(StreamInterface $stream): void
{
if (!$stream->isReadable()) {
throw new \InvalidArgumentException('Each stream must be readable');
}
// The stream is only seekable if all streams are seekable
if (!$stream->isSeekable()) {
$this->seekable = false;
}
$this->streams[] = $stream;
}
public function getContents(): string
{
return Utils::copyToString($this);
}
/**
* Closes each attached stream.
*/
public function close(): void
{
$this->pos = $this->current = 0;
$this->seekable = true;
foreach ($this->streams as $stream) {
$stream->close();
}
$this->streams = [];
}
/**
* Detaches each attached stream.
*
* Returns null as it's not clear which underlying stream resource to return.
*/
public function detach()
{
$this->pos = $this->current = 0;
$this->seekable = true;
foreach ($this->streams as $stream) {
$stream->detach();
}
$this->streams = [];
return null;
}
public function tell(): int
{
return $this->pos;
}
/**
* Tries to calculate the size by adding the size of each stream.
*
* If any of the streams do not return a valid number, then the size of the
* append stream cannot be determined and null is returned.
*/
public function getSize(): ?int
{
$size = 0;
foreach ($this->streams as $stream) {
$s = $stream->getSize();
if ($s === null) {
return null;
}
$size += $s;
}
return $size;
}
public function eof(): bool
{
return !$this->streams
|| ($this->current >= count($this->streams) - 1
&& $this->streams[$this->current]->eof());
}
public function rewind(): void
{
$this->seek(0);
}
/**
* Attempts to seek to the given position. Only supports SEEK_SET.
*/
public function seek($offset, $whence = SEEK_SET): void
{
if (!$this->seekable) {
throw new \RuntimeException('This AppendStream is not seekable');
} elseif ($whence !== SEEK_SET) {
throw new \RuntimeException('The AppendStream can only seek with SEEK_SET');
}
$this->pos = $this->current = 0;
// Rewind each stream
foreach ($this->streams as $i => $stream) {
try {
$stream->rewind();
} catch (\Exception $e) {
throw new \RuntimeException('Unable to seek stream '
.$i.' of the AppendStream', 0, $e);
}
}
// Seek to the actual position by reading from each stream
while ($this->pos < $offset && !$this->eof()) {
$result = $this->read(min(8096, $offset - $this->pos));
if ($result === '') {
break;
}
}
}
/**
* Reads from all of the appended streams until the length is met or EOF.
*/
public function read($length): string
{
$buffer = '';
$total = count($this->streams) - 1;
$remaining = $length;
$progressToNext = false;
while ($remaining > 0) {
// Progress to the next stream if needed.
if ($progressToNext || $this->streams[$this->current]->eof()) {
$progressToNext = false;
if ($this->current === $total) {
break;
}
++$this->current;
}
$result = $this->streams[$this->current]->read($remaining);
if ($result === '') {
$progressToNext = true;
continue;
}
$buffer .= $result;
$remaining = $length - strlen($buffer);
}
$this->pos += strlen($buffer);
return $buffer;
}
public function isReadable(): bool
{
return true;
}
public function isWritable(): bool
{
return false;
}
public function isSeekable(): bool
{
return $this->seekable;
}
public function write($string): int
{
throw new \RuntimeException('Cannot write to an AppendStream');
}
/**
* @return mixed
*/
public function getMetadata($key = null)
{
return $key ? null : [];
}
}
Developer
Welcome to the Kueue Pay Payment Gateway Solutions Developer API Documentation. This comprehensive guide will empower you to seamlessly integrate our advanced payment gateway into your website, enhancing your customers’ payment experience and enabling efficient transaction processing. The Kueue Pay Developer API is designed for developers and entrepreneurs who seek simplicity, security, and reliability in their payment processing solutions.
The Kueue Pay Developer API allows you to seamlessly integrate Kueue Pay’s Payment Gateway Solutions into your website, enabling secure and efficient debit and credit card transactions. With our API, you can initiate payments, check payment statuses, and even process refunds, all while ensuring a smooth and streamlined payment experience for your customers.