createStreamFromFile(string $filename, string $mode = 'r') : \Psr\Http\Message\StreamInterface
Create a stream from an existing file.
The file MUST be opened using the given mode, which may be any mode
supported by the fopen function.
The $filename MAY be any string supported by fopen().
| string | $filename | Filename or stream URI to use as basis of stream. |
| string | $mode | Mode with which to open the underlying filename/stream. |
If the file cannot be opened.
If the mode is invalid.
createStreamFromResource(resource $resource) : \Psr\Http\Message\StreamInterface
Create a new stream from an existing resource.
The stream MUST be readable and may be writable.
| resource | $resource | PHP resource to use as basis of stream. |