159 lines
4.7 KiB
PHP
159 lines
4.7 KiB
PHP
<?php
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namespace Psr\Http\Message;
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/**
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* Describes a data stream.
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*
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* Typically, an instance will wrap a PHP stream; this interface provides
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* a wrapper around the most common operations, including serialization of
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* the entire stream to a string.
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*/
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interface StreamInterface
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{
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/**
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* Reads all data from the stream into a string, from the beginning to end.
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*
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* This method MUST attempt to seek to the beginning of the stream before
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* reading data and read the stream until the end is reached.
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*
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* Warning: This could attempt to load a large amount of data into memory.
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*
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* This method MUST NOT raise an exception in order to conform with PHP's
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* string casting operations.
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*
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* @see http://php.net/manual/en/language.oop5.magic.php#object.tostring
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* @return string
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*/
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public function __toString(): string;
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/**
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* Closes the stream and any underlying resources.
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*
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* @return void
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*/
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public function close(): void;
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/**
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* Separates any underlying resources from the stream.
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*
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* After the stream has been detached, the stream is in an unusable state.
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*
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* @return resource|null Underlying PHP stream, if any
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*/
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public function detach();
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/**
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* Get the size of the stream if known.
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*
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* @return int|null Returns the size in bytes if known, or null if unknown.
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*/
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public function getSize(): ?int;
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/**
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* Returns the current position of the file read/write pointer
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*
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* @return int Position of the file pointer
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* @throws \RuntimeException on error.
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*/
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public function tell(): int;
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/**
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* Returns true if the stream is at the end of the stream.
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*
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* @return bool
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*/
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public function eof(): bool;
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/**
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* Returns whether or not the stream is seekable.
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*
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* @return bool
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*/
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public function isSeekable(): bool;
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/**
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* Seek to a position in the stream.
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*
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* @link http://www.php.net/manual/en/function.fseek.php
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* @param int $offset Stream offset
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* @param int $whence Specifies how the cursor position will be calculated
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* based on the seek offset. Valid values are identical to the built-in
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* PHP $whence values for `fseek()`. SEEK_SET: Set position equal to
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* offset bytes SEEK_CUR: Set position to current location plus offset
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* SEEK_END: Set position to end-of-stream plus offset.
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* @throws \RuntimeException on failure.
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*/
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public function seek(int $offset, int $whence = SEEK_SET): void;
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/**
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* Seek to the beginning of the stream.
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*
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* If the stream is not seekable, this method will raise an exception;
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* otherwise, it will perform a seek(0).
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*
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* @see seek()
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* @link http://www.php.net/manual/en/function.fseek.php
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* @throws \RuntimeException on failure.
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*/
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public function rewind(): void;
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/**
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* Returns whether or not the stream is writable.
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*
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* @return bool
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*/
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public function isWritable(): bool;
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/**
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* Write data to the stream.
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*
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* @param string $string The string that is to be written.
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* @return int Returns the number of bytes written to the stream.
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* @throws \RuntimeException on failure.
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*/
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public function write(string $string): int;
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/**
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* Returns whether or not the stream is readable.
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*
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* @return bool
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*/
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public function isReadable(): bool;
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/**
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* Read data from the stream.
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*
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* @param int $length Read up to $length bytes from the object and return
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* them. Fewer than $length bytes may be returned if underlying stream
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* call returns fewer bytes.
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* @return string Returns the data read from the stream, or an empty string
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* if no bytes are available.
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* @throws \RuntimeException if an error occurs.
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*/
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public function read(int $length): string;
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/**
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* Returns the remaining contents in a string
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*
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* @return string
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* @throws \RuntimeException if unable to read or an error occurs while
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* reading.
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*/
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public function getContents(): string;
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/**
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* Get stream metadata as an associative array or retrieve a specific key.
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*
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* The keys returned are identical to the keys returned from PHP's
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* stream_get_meta_data() function.
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*
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* @link http://php.net/manual/en/function.stream-get-meta-data.php
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* @param string|null $key Specific metadata to retrieve.
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* @return array|mixed|null Returns an associative array if no key is
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* provided. Returns a specific key value if a key is provided and the
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* value is found, or null if the key is not found.
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*/
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public function getMetadata(?string $key = null);
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}
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