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# php_stream_copy_to_stream

(no version information, might be only in CVS)

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.

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

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