Reads to EOF on the given file pointer from the current
position and writes the results to the output buffer.
If an error occurs, fpassthru()
returns FALSE. Otherwise, fpassthru() returns the number of
characters read from handle
and passed through to the output.
The file pointer must be valid, and must point to a file
successfully opened by fopen(), popen(), or
fsockopen(). You may need to call rewind()
to reset the file pointer to the beginning of the file if you
have already written data to the file. The file is closed
when fpassthru() is done reading it
(leaving handle
useless).
If you just want to dump the contents of a file to the
output buffer, without first modifying it or seeking to a
particular offset, you may want to use the
readfile(), which saves you the fopen()
call.
注: When using fpassthru() on a binary file on Windows systems, you should make sure to open the file in binary mode by appending a b to the mode used in the call to fopen().
You are encouraged to use the b flag when dealing with binary files, even if your system does not require it, so that your scripts will be more portable.
See also readfile(),
fopen(), popen(),
and
fsockopen()