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

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