2021-01-31 11:05:37 +01:00
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# PSR-7
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## [PSR-7](https://www.php-fig.org/psr/psr-7/)
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2021-09-20 19:35:32 +02:00
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Standard of the PHP Framework Interop Group that defines common interfaces for handling HTTP messages.
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2021-01-31 11:05:37 +01:00
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- `Psr\Http\Message\MessageInterface`
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- `Psr\Http\Message\RequestInterface`
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- `Psr\Http\Message\ResponseInterface`
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- `Psr\Http\Message\ServerRequestInterface`
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- `Psr\Http\Message\StreamInterface`
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- `Psr\Http\Message\UploadedFileInterface`
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- `Psr\Http\Message\UriInterface`
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Example:
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```php
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// empty array if not found
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$header = $request->getHeader('Accept');
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// empty string if not found
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$header = $request->getHeaderLine('Accept');
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// check the presence of a header
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if (! $request->hasHeader('Accept')) {}
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// returns the parameters in a query string
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$query = $request->getQueryParams();
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```
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### Immutability
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PSR-7 requests are *immutable* objects; a change in the data will return a new instance of the object.
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The stream objects of PSR-7 are *not immutable*.
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