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PHP flush() not working with IIS

Posted on 2009-07-07
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Last Modified: 2013-11-10
It tried disabling all output caching and compression I could find in IIS Manager, yet the buffer flush functions are not working properly. Neither ob_flush() nor regular flush() function seem to have any result. The output data remains on the server until script finishes executing.
I searched internet for several days without any luck.
Any help will be greatly appreciated.
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Question by:andrisv24
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4 Comments
 
LVL 3

Assisted Solution

by:laneway
laneway earned 400 total points
ID: 24798555
If you use print() followed by ob_flush() and then flush() your output should be sent to the client. However, depending on what you are trying to do the browser may not show you that data even if it has received it. And different browsers may behave differently. Can you provide more detail about what you are trying to do?

In the meantime, this code is a simple test you can use to test browser behavior:
// print and flush "hello"
print "hello"; ob_flush(); flush();
// wait 3 seconds
sleep(3);
// print and flush "world"
print " world"; ob_flush(); flush();

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Author Comment

by:andrisv24
ID: 24798881
That's exactly what i'm trying to do send one line of output then wait and send more output. I tried both print() and echo();
I know for a fact that all output is buffered at the server and nothing goes to the client. The same script i'm using worked perfectly fine on apache server. However the IIS does not let the output through.
And unfortunately, I am forced to stick with IIS on this machine.
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LVL 3

Assisted Solution

by:laneway
laneway earned 400 total points
ID: 24798978
Try this - it's a bit crazy but I've heard that it works in some cases... The server's output buffer has a maximum size. If you can fill it up, then any output that follows might be sent right away. So you print garbage first, which you will have to catch and discard, and then you use the rest of the output as desire. Here's the code (if it doesn't work, try a number higher than 4096):
// fill the output buffer (hopefully)
print str_repeat('x',4096); ob_flush(); flush();
// print and flush "hello"
print "hello"; ob_flush(); flush();
// wait 3 seconds
sleep(3);
// print and flush "world"
print " world"; ob_flush(); flush();

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Accepted Solution

by:
andrisv24 earned 0 total points
ID: 24799058
Thanks Ianeway. I saw this one during my search tried it. Used a number as high as 40000000. all it does is take forever for page to load, but the hello and world are displayed immediately with no delay inbetween.
Apparently this question is harder than i though so i'm increasing points to 500
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