StreamInterface
in
Describes a data stream.
Typically, an instance will wrap a PHP stream; this interface provides a wrapper around the most common operations, including serialization of the entire stream to a string.
Table of Contents
- __toString() : string
- Reads all data from the stream into a string, from the beginning to end.
- close() : void
- Closes the stream and any underlying resources.
- detach() : resource|null
- Separates any underlying resources from the stream.
- eof() : bool
- Returns true if the stream is at the end of the stream.
- getContents() : string
- Returns the remaining contents in a string
- getMetadata() : array<string|int, mixed>|mixed|null
- Get stream metadata as an associative array or retrieve a specific key.
- getSize() : int|null
- Get the size of the stream if known.
- isReadable() : bool
- Returns whether or not the stream is readable.
- isSeekable() : bool
- Returns whether or not the stream is seekable.
- isWritable() : bool
- Returns whether or not the stream is writable.
- read() : string
- Read data from the stream.
- rewind() : mixed
- Seek to the beginning of the stream.
- seek() : mixed
- Seek to a position in the stream.
- tell() : int
- Returns the current position of the file read/write pointer
- write() : int
- Write data to the stream.
Methods
__toString()
Reads all data from the stream into a string, from the beginning to end.
public
__toString() : string
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.
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Return values
string —close()
Closes the stream and any underlying resources.
public
close() : void
Return values
void —detach()
Separates any underlying resources from the stream.
public
detach() : resource|null
After the stream has been detached, the stream is in an unusable state.
Return values
resource|null —Underlying PHP stream, if any
eof()
Returns true if the stream is at the end of the stream.
public
eof() : bool
Return values
bool —getContents()
Returns the remaining contents in a string
public
getContents() : string
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Return values
string —getMetadata()
Get stream metadata as an associative array or retrieve a specific key.
public
getMetadata([string $key = null ]) : array<string|int, mixed>|mixed|null
The keys returned are identical to the keys returned from PHP's stream_get_meta_data() function.
Parameters
- $key : string = null
-
Specific metadata to retrieve.
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Return values
array<string|int, mixed>|mixed|null —Returns an associative array if no key is provided. Returns a specific key value if a key is provided and the value is found, or null if the key is not found.
getSize()
Get the size of the stream if known.
public
getSize() : int|null
Return values
int|null —Returns the size in bytes if known, or null if unknown.
isReadable()
Returns whether or not the stream is readable.
public
isReadable() : bool
Return values
bool —isSeekable()
Returns whether or not the stream is seekable.
public
isSeekable() : bool
Return values
bool —isWritable()
Returns whether or not the stream is writable.
public
isWritable() : bool
Return values
bool —read()
Read data from the stream.
public
read(int $length) : string
Parameters
- $length : int
-
Read up to $length bytes from the object and return them. Fewer than $length bytes may be returned if underlying stream call returns fewer bytes.
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Return values
string —Returns the data read from the stream, or an empty string if no bytes are available.
rewind()
Seek to the beginning of the stream.
public
rewind() : mixed
If the stream is not seekable, this method will raise an exception; otherwise, it will perform a seek(0).
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Return values
mixed —seek()
Seek to a position in the stream.
public
seek(int $offset[, int $whence = SEEK_SET ]) : mixed
Parameters
- $offset : int
-
Stream offset
- $whence : int = SEEK_SET
-
Specifies how the cursor position will be calculated based on the seek offset. Valid values are identical to the built-in PHP $whence values for
fseek(). SEEK_SET: Set position equal to offset bytes SEEK_CUR: Set position to current location plus offset SEEK_END: Set position to end-of-stream plus offset.
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Return values
mixed —tell()
Returns the current position of the file read/write pointer
public
tell() : int
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Return values
int —Position of the file pointer
write()
Write data to the stream.
public
write(string $string) : int
Parameters
- $string : string
-
The string that is to be written.
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Return values
int —Returns the number of bytes written to the stream.