flush
(PHP 3, PHP 4 )
flush -- Flush the output buffer
Description
void flush ( void )
Flushes the output buffers of PHP and whatever backend PHP
is using (CGI, a web server, etc). This effectively tries
to push all the output so far to the user's browser.
flush() has no effect on the buffering scheme of your webserver
or the browser on the client side.
Several servers, especially on Win32, will still buffer
the output from your script until it terminates before transmitting
the results to the browser.
Server modules for Apache like mod_gzip may do buffering
of their own that will cause flush() to not result in data
being sent immediately to the client.
Even the browser may buffer its input before displaying
it. Netscape, for example, buffers text until it receives
an end-of-line or the beginning of a tag, and it won't render
tables until the </table> tag of the outermost table
is seen.
Some versions of Microsoft Internet Explorer will only
start to display the page after they have received 256 bytes
of output, so you may need to send extra whitespace before
flushing to get those browsers to display the page.
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