Recipe 18.18 Flushing Output to a File
18.18.1 Problem
You want to force all
buffered data to be written to a
filehandle.
18.18.2 Solution
Use fflush( ):
fwrite($fh,'There are twelve pumpkins in my house.');
fflush($fh);
This ensures that "There
are twelve pumpkins in
my house." is
written to $fh.
18.18.3 Discussion
To be more efficient, system I/O libraries generally
don't write something to a file when you tell them
to. Instead, they batch the writes together in a buffer and save all
of them to disk at the same time. Using fflush( )
forces anything pending in the write buffer to be actually written to
disk.
Flushing output can be particularly
helpful when generating an access or activity log. Calling
fflush( ) after each message to log file makes
sure that any person or program monitoring the log file sees the
message as soon as possible.
18.18.4 See Also
Documentation on fflush( ) at
http://www.php.net/fflush.
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