PHP output text before sleep

Question

I want PHP to output some text, then sleep for a second and a half, and then output some more text.

<?php

echo 'Output one.';

usleep(1500000);

echo 'Output two.';

?>

My problem is that all text is being put out simultaneously - after having waited those 1.5 seconds. I have read something about a function called flush - but it doesn't seem to work. Maybe I'm not using it write. Any help would be appreciated ^^

Thanks in advance!

Answer 1

check this out

<?php

ob_start();

echo 'Output one.';
ob_flush();
usleep(1500000);
echo 'Output two.';
ob_flush();

?>

Answer 2

Pentium10's answer did not quite work for me.. However when I went to the PHP documentation page, there were a lot of good comments on there.

http://php.net/manual/en/function.ob-flush.php

This worked for me using Firefox 3.5.9, PHP 5.2.11, Apache running off local Windows 7 laptop:

echo "test";
ob_end_flush();
flush();
usleep(x);
echo "test";

The ob_end_flush() was crucial to getting data sent.