Class CallbackStream
Implementation of PSR HTTP streams.
This differs from Zend\Diactoros\Callback stream in that
it allows the use of echo inside the callback, and gracefully
handles the callback not returning a string.
Ideally we can amend/update diactoros, but we need to figure that out with the diactoros project. Until then we'll use this shim to provide backwards compatibility with existing CakePHP apps.
Property Summary
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$callback protected
callable|null
Method Summary
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__construct() public
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__toString() public
Reads all data from the stream into a string, from the beginning to end.
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attach() public
Attach a new callback to the instance.
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close() public
Closes the stream and any underlying resources.
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detach() public
Separates any underlying resources from the stream.
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eof() public
Returns true if the stream is at the end of the stream.
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getContents() public
Returns the remaining contents in a string
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getMetadata() public
Get stream metadata as an associative array or retrieve a specific key.
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getSize() public
Get the size of the stream if known.
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isReadable() public
Returns whether or not the stream is readable.
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isSeekable() public
Returns whether or not the stream is seekable.
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isWritable() public
Returns whether or not the stream is writable.
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read() public
Read data from the stream.
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rewind() public
Seek to the beginning of the stream.
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seek() public
Seek to a position in the stream.
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tell() public
Returns the current position of the file read/write pointer
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write() public
Write data to the stream.
Method Detail
__construct() ¶ public
__construct(callable $callback)Parameters
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callable$callback
Throws
InvalidArgumentException__toString() ¶ public
__toString(): stringReads all data from the stream into a string, from the beginning to end.
This method MUST attempt to seek to the beginning of the stream before reading data and read the stream until the end is reached.
Warning: This could attempt to load a large amount of data into memory.
This method MUST NOT raise an exception in order to conform with PHP's string casting operations.
Returns
stringattach() ¶ public
attach(callable $callback)Attach a new callback to the instance.
Parameters
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callable$callback
Throws
InvalidArgumentExceptionfor callable callback
detach() ¶ public
detach(): resource|nullSeparates any underlying resources from the stream.
After the stream has been detached, the stream is in an unusable state.
Returns
resource|nullgetContents() ¶ public
getContents(): stringReturns the remaining contents in a string
Returns
stringgetMetadata() ¶ public
getMetadata(string|null $key = null): array|mixed|nullGet stream metadata as an associative array or retrieve a specific key.
The keys returned are identical to the keys returned from PHP's stream_get_meta_data() function.
Parameters
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string|null$key optional
Returns
array|mixed|nullisReadable() ¶ public
isReadable(): boolReturns whether or not the stream is readable.
Returns
boolisSeekable() ¶ public
isSeekable(): boolReturns whether or not the stream is seekable.
Returns
boolisWritable() ¶ public
isWritable(): boolReturns whether or not the stream is writable.
Returns
boolread() ¶ public
read(int $length): stringRead data from the stream.
Parameters
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int$length
Returns
stringrewind() ¶ public
rewind()Seek to the beginning of the stream.
If the stream is not seekable, this method will raise an exception; otherwise, it will perform a seek(0).
seek() ¶ public
seek(int $offset, int $whence = SEEK_SET)Seek to a position in the stream.
Parameters
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int$offset -
int$whence optional
write() ¶ public
write(string $string): intWrite data to the stream.
Parameters
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string$string
Returns
int