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# Interfaces
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The purpose of this list is to help in finding the methods when working with PSR-7. This can be considered as a cheatsheet for PSR-7 interfaces.
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The interfaces defined in PSR-7 are the following:
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| Class Name | Description |
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|---|---|
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| [Psr\Http\Message\MessageInterface](http://www.php-fig.org/psr/psr-7/#psrhttpmessagemessageinterface) | Representation of a HTTP message |
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| [Psr\Http\Message\RequestInterface](http://www.php-fig.org/psr/psr-7/#psrhttpmessagerequestinterface) | Representation of an outgoing, client-side request. |
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| [Psr\Http\Message\ServerRequestInterface](http://www.php-fig.org/psr/psr-7/#psrhttpmessageserverrequestinterface) | Representation of an incoming, server-side HTTP request. |
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| [Psr\Http\Message\ResponseInterface](http://www.php-fig.org/psr/psr-7/#psrhttpmessageresponseinterface) | Representation of an outgoing, server-side response. |
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| [Psr\Http\Message\StreamInterface](http://www.php-fig.org/psr/psr-7/#psrhttpmessagestreaminterface) | Describes a data stream |
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| [Psr\Http\Message\UriInterface](http://www.php-fig.org/psr/psr-7/#psrhttpmessageuriinterface) | Value object representing a URI. |
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| [Psr\Http\Message\UploadedFileInterface](http://www.php-fig.org/psr/psr-7/#psrhttpmessageuploadedfileinterface) | Value object representing a file uploaded through an HTTP request. |
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## `Psr\Http\Message\MessageInterface` Methods
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| Method Name | Description | Notes |
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|------------------------------------| ----------- | ----- |
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| `getProtocolVersion()` | Retrieve HTTP protocol version | 1.0 or 1.1 |
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| `withProtocolVersion($version)` | Returns new message instance with given HTTP protocol version | |
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| `getHeaders()` | Retrieve all HTTP Headers | [Request Header List](https://en.wikipedia.org/wiki/List_of_HTTP_header_fields#Request_fields), [Response Header List](https://en.wikipedia.org/wiki/List_of_HTTP_header_fields#Response_fields) |
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| `hasHeader($name)` | Checks if HTTP Header with given name exists | |
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| `getHeader($name)` | Retrieves a array with the values for a single header | |
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| `getHeaderLine($name)` | Retrieves a comma-separated string of the values for a single header | |
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| `withHeader($name, $value)` | Returns new message instance with given HTTP Header | if the header existed in the original instance, replaces the header value from the original message with the value provided when creating the new instance. |
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| `withAddedHeader($name, $value)` | Returns new message instance with appended value to given header | If header already exists value will be appended, if not a new header will be created |
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| `withoutHeader($name)` | Removes HTTP Header with given name| |
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| `getBody()` | Retrieves the HTTP Message Body | Returns object implementing `StreamInterface`|
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| `withBody(StreamInterface $body)` | Returns new message instance with given HTTP Message Body | |
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## `Psr\Http\Message\RequestInterface` Methods
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Same methods as `Psr\Http\Message\MessageInterface` + the following methods:
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| Method Name | Description | Notes |
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|------------------------------------| ----------- | ----- |
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| `getRequestTarget()` | Retrieves the message's request target | origin-form, absolute-form, authority-form, asterisk-form ([RFC7230](https://www.rfc-editor.org/rfc/rfc7230.txt)) |
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| `withRequestTarget($requestTarget)` | Return a new message instance with the specific request-target | |
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| `getMethod()` | Retrieves the HTTP method of the request. | GET, HEAD, POST, PUT, DELETE, CONNECT, OPTIONS, TRACE (defined in [RFC7231](https://tools.ietf.org/html/rfc7231)), PATCH (defined in [RFC5789](https://tools.ietf.org/html/rfc5789)) |
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| `withMethod($method)` | Returns a new message instance with the provided HTTP method | |
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| `getUri()` | Retrieves the URI instance | |
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| `withUri(UriInterface $uri, $preserveHost = false)` | Returns a new message instance with the provided URI | |
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## `Psr\Http\Message\ServerRequestInterface` Methods
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Same methods as `Psr\Http\Message\RequestInterface` + the following methods:
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| Method Name | Description | Notes |
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|------------------------------------| ----------- | ----- |
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| `getServerParams() ` | Retrieve server parameters | Typically derived from `$_SERVER` |
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| `getCookieParams()` | Retrieves cookies sent by the client to the server. | Typically derived from `$_COOKIES` |
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| `withCookieParams(array $cookies)` | Returns a new request instance with the specified cookies | |
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| `withQueryParams(array $query)` | Returns a new request instance with the specified query string arguments | |
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| `getUploadedFiles()` | Retrieve normalized file upload data | |
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| `withUploadedFiles(array $uploadedFiles)` | Returns a new request instance with the specified uploaded files | |
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| `getParsedBody()` | Retrieve any parameters provided in the request body | |
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| `withParsedBody($data)` | Returns a new request instance with the specified body parameters | |
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| `getAttributes()` | Retrieve attributes derived from the request | |
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| `getAttribute($name, $default = null)` | Retrieve a single derived request attribute | |
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| `withAttribute($name, $value)` | Returns a new request instance with the specified derived request attribute | |
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| `withoutAttribute($name)` | Returns a new request instance that without the specified derived request attribute | |
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## `Psr\Http\Message\ResponseInterface` Methods:
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Same methods as `Psr\Http\Message\MessageInterface` + the following methods:
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| Method Name | Description | Notes |
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|------------------------------------| ----------- | ----- |
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| `getStatusCode()` | Gets the response status code. | |
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| `withStatus($code, $reasonPhrase = '')` | Returns a new response instance with the specified status code and, optionally, reason phrase. | |
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| `getReasonPhrase()` | Gets the response reason phrase associated with the status code. | |
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## `Psr\Http\Message\StreamInterface` Methods
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| Method Name | Description | Notes |
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|------------------------------------| ----------- | ----- |
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| `__toString()` | Reads all data from the stream into a string, from the beginning to end. | |
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| `close()` | Closes the stream and any underlying resources. | |
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| `detach()` | Separates any underlying resources from the stream. | |
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| `getSize()` | Get the size of the stream if known. | |
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| `eof()` | Returns true if the stream is at the end of the stream.| |
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| `isSeekable()` | Returns whether or not the stream is seekable. | |
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| `seek($offset, $whence = SEEK_SET)` | Seek to a position in the stream. | |
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| `rewind()` | Seek to the beginning of the stream. | |
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| `isWritable()` | Returns whether or not the stream is writable. | |
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| `write($string)` | Write data to the stream. | |
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| `isReadable()` | Returns whether or not the stream is readable. | |
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| `read($length)` | Read data from the stream. | |
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| `getContents()` | Returns the remaining contents in a string | |
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| `getMetadata($key = null)()` | Get stream metadata as an associative array or retrieve a specific key. | |
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## `Psr\Http\Message\UriInterface` Methods
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| Method Name | Description | Notes |
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|------------------------------------| ----------- | ----- |
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| `getScheme()` | Retrieve the scheme component of the URI. | |
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| `getAuthority()` | Retrieve the authority component of the URI. | |
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| `getUserInfo()` | Retrieve the user information component of the URI. | |
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| `getHost()` | Retrieve the host component of the URI. | |
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| `getPort()` | Retrieve the port component of the URI. | |
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| `getPath()` | Retrieve the path component of the URI. | |
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| `getQuery()` | Retrieve the query string of the URI. | |
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| `getFragment()` | Retrieve the fragment component of the URI. | |
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| `withScheme($scheme)` | Return an instance with the specified scheme. | |
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| `withUserInfo($user, $password = null)` | Return an instance with the specified user information. | |
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| `withHost($host)` | Return an instance with the specified host. | |
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| `withPort($port)` | Return an instance with the specified port. | |
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| `withPath($path)` | Return an instance with the specified path. | |
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| `withQuery($query)` | Return an instance with the specified query string. | |
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| `withFragment($fragment)` | Return an instance with the specified URI fragment. | |
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| `__toString()` | Return the string representation as a URI reference. | |
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## `Psr\Http\Message\UploadedFileInterface` Methods
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| Method Name | Description | Notes |
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|------------------------------------| ----------- | ----- |
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| `getStream()` | Retrieve a stream representing the uploaded file. | |
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| `moveTo($targetPath)` | Move the uploaded file to a new location. | |
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| `getSize()` | Retrieve the file size. | |
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| `getError()` | Retrieve the error associated with the uploaded file. | |
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| `getClientFilename()` | Retrieve the filename sent by the client. | |
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| `getClientMediaType()` | Retrieve the media type sent by the client. | |
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> `RequestInterface`, `ServerRequestInterface`, `ResponseInterface` extend `MessageInterface` because the `Request` and the `Response` are `HTTP Messages`.
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> When using `ServerRequestInterface`, both `RequestInterface` and `Psr\Http\Message\MessageInterface` methods are considered.
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