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     * string casting operations.
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     * string casting operations.
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     *
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     *
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     * @see http://php.net/manual/en/language.oop5.magic.php#object.tostring
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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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     * @return string
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     */
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     */
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    public function __toString();
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    public function __toString(): string;
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    /**
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    /**
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     * Closes the stream and any underlying resources.
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     * Closes the stream and any underlying resources.
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     *
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     *
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     * @return void
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     * @return void
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     */
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     */
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    public function close();
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    public function close(): void;
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    /**
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    /**
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     * Separates any underlying resources from the stream.
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     * Separates any underlying resources from the stream.
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    /**
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    /**
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     * Get the size of the stream if known.
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     * Get the size of the stream if known.
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     *
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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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     * @return int|null Returns the size in bytes if known, or null if unknown.
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     */
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     */
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    public function getSize();
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    public function getSize(): ?int;
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    /**
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    /**
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     * Returns the current position of the file read/write pointer
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     * Returns the current position of the file read/write pointer
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     *
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     *
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     * @return int Position of the file pointer
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     * @return int Position of the file pointer
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     * @throws \RuntimeException on error.
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     * @throws \RuntimeException on error.
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     */
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     */
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    public function tell();
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    public function tell(): int;
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    /**
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    /**
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     * Returns true if the stream is at the end of the stream.
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     * Returns true if the stream is at the end of the stream.
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     *
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     *
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     * @return bool
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     * @return bool
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     */
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     */
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    public function eof();
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    public function eof(): bool;
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    /**
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    /**
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     * Returns whether or not the stream is seekable.
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     * Returns whether or not the stream is seekable.
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     *
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     *
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     * @return bool
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     * @return bool
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     */
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     */
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    public function isSeekable();
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    public function isSeekable(): bool;
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     *     PHP $whence values for `fseek()`.  SEEK_SET: Set position equal to
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     *     PHP $whence values for `fseek()`.  SEEK_SET: Set position equal to
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     *     offset bytes SEEK_CUR: Set position to current location plus offset
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     *     offset bytes SEEK_CUR: Set position to current location plus offset
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     *     SEEK_END: Set position to end-of-stream plus offset.
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     *     SEEK_END: Set position to end-of-stream plus offset.
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     * @throws \RuntimeException on failure.
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     * @throws \RuntimeException on failure.
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     */
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     */
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    public function seek($offset, $whence = SEEK_SET);
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    public function seek(int $offset, int $whence = SEEK_SET): void;
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    /**
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    /**
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     * Seek to the beginning of the stream.
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     * Seek to the beginning of the stream.
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     *
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     *
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     *
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     *
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     * @see seek()
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     * @see seek()
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     * @link http://www.php.net/manual/en/function.fseek.php
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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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     * @throws \RuntimeException on failure.
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     */
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     */
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    public function rewind();
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    public function rewind(): void;
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    /**
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    /**
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     * Returns whether or not the stream is writable.
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     * Returns whether or not the stream is writable.
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     *
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     *
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     * @return bool
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     * @return bool
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     */
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     */
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    public function isWritable();
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    public function isWritable(): bool;
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    /**
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    /**
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     * Write data to the stream.
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     * Write data to the stream.
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     *
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     *
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     * @param string $string The string that is to be written.
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     * @param string $string The string that is to be written.
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     * @return int Returns the number of bytes written to the stream.
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     * @return int Returns the number of bytes written to the stream.
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     * @throws \RuntimeException on failure.
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     * @throws \RuntimeException on failure.
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     */
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     */
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    public function write($string);
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    public function write(string $string): int;
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    /**
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    /**
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     * Returns whether or not the stream is readable.
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     * Returns whether or not the stream is readable.
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     *
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     *
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     * @return bool
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     * @return bool
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     */
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     */
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    public function isReadable();
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    public function isReadable(): bool;
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     *     call returns fewer bytes.
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     *     call returns fewer bytes.
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     * @return string Returns the data read from the stream, or an empty string
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     * @return string Returns the data read from the stream, or an empty string
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     *     if no bytes are available.
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     *     if no bytes are available.
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     * @throws \RuntimeException if an error occurs.
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     * @throws \RuntimeException if an error occurs.
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     */
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     */
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    public function read($length);
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    public function read(int $length): string;
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    /**
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    /**
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     * Returns the remaining contents in a string
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     * Returns the remaining contents in a string
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     *
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     *
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     * @return string
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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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     * @throws \RuntimeException if unable to read or an error occurs while
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     *     reading.
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     *     reading.
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     */
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     */
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    public function getContents();
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    public function getContents(): string;
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    /**
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    /**
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     * Get stream metadata as an associative array or retrieve a specific key.
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     * Get stream metadata as an associative array or retrieve a specific key.
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     *
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     *
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     * The keys returned are identical to the keys returned from PHP's
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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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     * stream_get_meta_data() function.
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     *
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     *
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     * @link http://php.net/manual/en/function.stream-get-meta-data.php
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     * @link http://php.net/manual/en/function.stream-get-meta-data.php
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     * @param string $key Specific metadata to retrieve.
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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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     * @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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     *     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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     *     value is found, or null if the key is not found.
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     */
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     */