# PSR-7 Message Implementation
This repository contains a full [PSR-7](http://www.php-fig.org/psr/psr-7/)
message implementation, several stream decorators, and some helpful
functionality like query string parsing.
[![Build Status](https://travis-ci.org/guzzle/psr7.svg?branch=master)](https://travis-ci.org/guzzle/psr7)
# Stream implementation
This package comes with a number of stream implementations and stream
decorators.
## AppendStream
`GuzzleHttp\Psr7\AppendStream`
Reads from multiple streams, one after the other.
```php
use GuzzleHttp\Psr7;
$a = Psr7\stream_for('abc, ');
$b = Psr7\stream_for('123.');
$composed = new Psr7\AppendStream([$a, $b]);
$composed->addStream(Psr7\stream_for(' Above all listen to me'));
echo $composed; // abc, 123. Above all listen to me.
```
## BufferStream
`GuzzleHttp\Psr7\BufferStream`
Provides a buffer stream that can be written to fill a buffer, and read
from to remove bytes from the buffer.
This stream returns a "hwm" metadata value that tells upstream consumers
what the configured high water mark of the stream is, or the maximum
preferred size of the buffer.
```php
use GuzzleHttp\Psr7;
// When more than 1024 bytes are in the buffer, it will begin returning
// false to writes. This is an indication that writers should slow down.
$buffer = new Psr7\BufferStream(1024);
```
## CachingStream
The CachingStream is used to allow seeking over previously read bytes on
non-seekable streams. This can be useful when transferring a non-seekable
entity body fails due to needing to rewind the stream (for example, resulting
from a redirect). Data that is read from the remote stream will be buffered in
a PHP temp stream so that previously read bytes are cached first in memory,
then on disk.
```php
use GuzzleHttp\Psr7;
$original = Psr7\stream_for(fopen('http://www.google.com', 'r'));
$stream = new Psr7\CachingStream($original);
$stream->read(1024);
echo $stream->tell();
// 1024
$stream->seek(0);
echo $stream->tell();
// 0
```
## DroppingStream
`GuzzleHttp\Psr7\DroppingStream`
Stream decorator that begins dropping data once the size of the underlying
stream becomes too full.
```php
use GuzzleHttp\Psr7;
// Create an empty stream
$stream = Psr7\stream_for();
// Start dropping data when the stream has more than 10 bytes
$dropping = new Psr7\DroppingStream($stream, 10);
$dropping->write('01234567890123456789');
echo $stream; // 0123456789
```
## FnStream
`GuzzleHttp\Psr7\FnStream`
Compose stream implementations based on a hash of functions.
Allows for easy testing and extension of a provided stream without needing
to create a concrete class for a simple extension point.
```php
use GuzzleHttp\Psr7;
$stream = Psr7\stream_for('hi');
$fnStream = Psr7\FnStream::decorate($stream, [
'rewind' => function () use ($stream) {
echo 'About to rewind - ';
$stream->rewind();
echo 'rewound!';
}
]);
$fnStream->rewind();
// Outputs: About to rewind - rewound!
```
## InflateStream
`GuzzleHttp\Psr7\InflateStream`
Uses PHP's zlib.inflate filter to inflate deflate or gzipped content.
This stream decorator skips the first 10 bytes of the given stream to remove
the gzip header, converts the provided stream to a PHP stream resource,
then appends the zlib.inflate filter. The stream is then converted back
to a Guzzle stream resource to be used as a Guzzle stream.
## LazyOpenStream
`GuzzleHttp\Psr7\LazyOpenStream`
Lazily reads or writes to a file that is opened only after an IO operation
take place on the stream.
```php
use GuzzleHttp\Psr7;
$stream = new Psr7\LazyOpenStream('/path/to/file', 'r');
// The file has not yet been opened...
echo $stream->read(10);
// The file is opened and read from only when needed.
```
## LimitStream
`GuzzleHttp\Psr7\LimitStream`
LimitStream can be used to read a subset or slice of an existing stream object.
This can be useful for breaking a large file into smaller pieces to be sent in
chunks (e.g. Amazon S3's multipart upload API).
```php
use GuzzleHttp\Psr7;
$original = Psr7\stream_for(fopen('/tmp/test.txt', 'r+'));
echo $original->getSize();
// >>> 1048576
// Limit the size of the body to 1024 bytes and start reading from byte 2048
$stream = new Psr7\LimitStream($original, 1024, 2048);
echo $stream->getSize();
// >>> 1024
echo $stream->tell();
// >>> 0
```
## MultipartStream
`GuzzleHttp\Psr7\MultipartStream`
Stream that when read returns bytes for a streaming multipart or
multipart/form-data stream.
## NoSeekStream
`GuzzleHttp\Psr7\NoSeekStream`
NoSeekStream wraps a stream and does not allow seeking.
```php
use GuzzleHttp\Psr7;
$original = Psr7\stream_for('foo');
$noSeek = new Psr7\NoSeekStream($original);
echo $noSeek->read(3);
// foo
var_export($noSeek->isSeekable());
// false
$noSeek->seek(0);
var_export($noSeek->read(3));
// NULL
```
## PumpStream
`GuzzleHttp\Psr7\PumpStream`
Provides a read only stream that pumps data from a PHP callable.
When invoking the provided callable, the PumpStream will pass the amount of
data requested to read to the callable. The callable can choose to ignore
this value and return fewer or more bytes than requested. Any extra data
returned by the provided callable is buffered internally until drained using
the read() function of the PumpStream. The provided callable MUST return
false when there is no more data to read.
## Implementing stream decorators
Creating a stream decorator is very easy thanks to the
`GuzzleHttp\Psr7\StreamDecoratorTrait`. This trait provides methods that
implement `Psr\Http\Message\StreamInterface` by proxying to an underlying
stream. Just `use` the `StreamDecoratorTrait` and implement your custom
methods.
For example, let's say we wanted to call a specific function each time the last
byte is read from a stream. This could be implemented by overriding the
`read()` method.
```php
use Psr\Http\Message\StreamInterface;
use GuzzleHttp\Psr7\StreamDecoratorTrait;
class EofCallbackStream implements StreamInterface
{
use StreamDecoratorTrait;
private $callback;
public function __construct(StreamInterface $stream, callable $cb)
{
$this->stream = $stream;
$this->callback = $cb;
}
public function read($length)
{
$result = $this->stream->read($length);
// Invoke the callback when EOF is hit.
if ($this->eof()) {
call_user_func($this->callback);
}
return $result;
}
}
```
This decorator could be added to any existing stream and used like so:
```php
use GuzzleHttp\Psr7;
$original = Psr7\stream_for('foo');
$eofStream = new EofCallbackStream($original, function () {
echo 'EOF!';
});
$eofStream->read(2);
$eofStream->read(1);
// echoes "EOF!"
$eofStream->seek(0);
$eofStream->read(3);
// echoes "EOF!"
```
## PHP StreamWrapper
You can use the `GuzzleHttp\Psr7\StreamWrapper` class if you need to use a
PSR-7 stream as a PHP stream resource.
Use the `GuzzleHttp\Psr7\StreamWrapper::getResource()` method to create a PHP
stream from a PSR-7 stream.
```php
use GuzzleHttp\Psr7\StreamWrapper;
$stream = GuzzleHttp\Psr7\stream_for('hello!');
$resource = StreamWrapper::getResource($stream);
echo fread($resource, 6); // outputs hello!
```
# Function API
There are various functions available under the `GuzzleHttp\Psr7` namespace.
## `function str`
`function str(MessageInterface $message)`
Returns the string representation of an HTTP message.
```php
$request = new GuzzleHttp\Psr7\Request('GET', 'http://example.com');
echo GuzzleHttp\Psr7\str($request);
```
## `function uri_for`
`function uri_for($uri)`
This function accepts a string or `Psr\Http\Message\UriInterface` and returns a
UriInterface for the given value. If the value is already a `UriInterface`, it
is returned as-is.
```php
$uri = GuzzleHttp\Psr7\uri_for('http://example.com');
assert($uri === GuzzleHttp\Psr7\uri_for($uri));
```
## `function stream_for`
`function stream_for($resource = '', array $options =
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【3.0新股申购】新版两融双融/新股申购/股票交易/股票配资/融资融券/打新股/配资系统 (2002个子文件)
UserServiceImpl.class 46KB
UserPositionServiceImpl.class 41KB
UserFuturesPositionServiceImpl.class 28KB
UserIndexPositionServiceImpl.class 25KB
UserFundsPositionServiceImpl.class 24KB
StockServiceImpl.class 23KB
SiteSetting.class 21KB
StockVO.class 20KB
UserPosition.class 20KB
AdminPositionVO.class 18KB
AgentPositionVO.class 18KB
User.class 18KB
UserFundsPosition.class 18KB
UserPositionVO.class 18KB
UserInfoVO.class 17KB
AgentUserListVO.class 17KB
SiteInfo.class 17KB
UserFuturesPosition.class 16KB
UserFuturesPositionVO.class 16KB
AdminFuturesPositionVO.class 16KB
AgentFuturesPositionVO.class 16KB
AgentUserServiceImpl.class 16KB
PayServiceImpl.class 15KB
UserRechargeServiceImpl.class 14KB
FundsApply.class 14KB
FundsAppend.class 14KB
UserWithdrawServiceImpl.class 13KB
AgentIndexPositionVO.class 13KB
AdminIndexPositionVO.class 13KB
UserIndexPositionVO.class 13KB
FuturesAdminListVO.class 13KB
StockFuturesServiceImpl.class 13KB
StockFuturesListVO.class 12KB
SinaStockApi.class 12KB
FundsSetting.class 12KB
CmcPayOuterRequestUtil.class 12KB
FundsApplyServiceImpl.class 11KB
SiteAdminServiceImpl.class 10KB
Mandate.class 10KB
UserController.class 10KB
StockIndexVO.class 9KB
StockMarketsDay.class 9KB
AgentAgencyFeeServiceImpl.class 9KB
StockIndexServiceImpl.class 9KB
FundsTradingAccount.class 9KB
StockListVO.class 8KB
StockIndex.class 8KB
QqStockApi.class 8KB
SitePay.class 8KB
StockPoll.class 8KB
SiteArticleServiceImpl.class 8KB
FundsSecuritiesInfo.class 8KB
AdminCountVO.class 8KB
StockAdminListVO.class 7KB
GuoPayVO.class 7KB
SiteNewsServiceImpl.class 7KB
UserStockSubscribeServiceImpl.class 7KB
FuturesVO.class 7KB
SiteNews.class 7KB
FundsAppendServiceImpl.class 7KB
UserFundsController.class 7KB
UserStockSubscribe.class 7KB
AgentInfoVO.class 6KB
UserIndexPosition.class 6KB
PayApiController.class 6KB
AdminApiController.class 6KB
HttpClientRequest.class 6KB
StockFutures.class 6KB
HttpRequest.class 6KB
SendHTMLMail.class 6KB
SmsDemo.class 6KB
FlyPayVO.class 6KB
AgentController.class 6KB
CoinAdminListVO.class 6KB
StockCoinServiceImpl.class 6KB
StockTask.class 6KB
SiteBanner.class 6KB
StockOptionListVO.class 6KB
DateTimeUtil.class 5KB
UserApiController.class 5KB
ExchangeVO.class 5KB
StockOptionServiceImpl.class 5KB
GetPyByChinese.class 5KB
StockMarketsDayServiceImpl.class 5KB
JsonUtil.class 5KB
FundsDealerInstitutions.class 5KB
VerifyCodeController.class 5KB
FundsLever.class 5KB
AgentUser.class 5KB
AdminController.class 5KB
UserCashDetailServiceImpl.class 5KB
FTPUtil.class 5KB
StockShTask.class 4KB
CmcPayTool.class 4KB
SinaStockMinData.class 4KB
AdminAgentController.class 4KB
AdminUserController.class 4KB
AgentApiController.class 4KB
AdminFundsDealerInstitutionsController.class 4KB
SiteMessageServiceImpl.class 4KB
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