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# php_stream_copy_to_stream

php_stream_copy_to_stream -- Copy data from one stream to another

## Description

size_t php_stream_copy_to_stream ( php_stream * src, php_stream * dest, size_t maxlen )

php_stream_copy_to_stream() attempts to read up to `maxlen` bytes of data from `src` and write them to `dest`, and returns the number of bytes that were successfully copied.

If you want to copy all remaining data from the `src` stream, pass the constant `PHP_STREAM_COPY_ALL` as the value of `maxlen`.

> Anmerkung: This function will attempt to copy the data in the most efficient manner, using memory mapped files when possible.

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