Is it possible to make a single PHP script ignore FastCGI's output buffer?

Question

I have a PHP script that needs to process some more information in the background after returning the response.

I made it work by following this answer as well as turning off FastCGI Output Buffer:

<IfModule mod_fcgid.c>
FcgidOutputBufferSize 0
</IfModule>

It won't work without turning off FastCGI Output Buffer.

However, I only have one script that needs this. It would be nice if I can keep FastCGI Output Buffer for all other scripts.

Is it possible to just make one PHP script ignore FastCGI Output Buffer?

It sounds like you need to run a task in the background, not futz around with output buffering. — Sammitch
– Sammitch, Commented Aug 18, 2016 at 0:59
Yeah so whatever function this is takes its parameters, performs its immediate tasks [eg: content generation], starts the background task, and returns. The page is delivered as expected without having to selectively disable output buffering, and whatever long-running thing you started is still going in the background. — Sammitch
– Sammitch, Commented Aug 18, 2016 at 1:16
Yes it's exactly what I need. Please add an answer with some code example. Like I said, the script I took from the other post's answer won't work without turning off FastCGI Output Buffer. The user gets the response after the long-running task finishes. — Shawn
– Shawn, Commented Aug 18, 2016 at 5:37
In that specific case, you could just prefill the (default) buffer, e.g. echo str_repeat(' ', 65537); — Simon
– Simon, Commented Jul 16, 2020 at 9:49

Cave Johnson · Accepted Answer · 2016-08-17 23:29:32Z

1

Maybe you can use nested Apache directives to check the request URI. Like this:

<IfModule mod_fcgid.c>
    <If "%{REQUEST_URI} == '/path/to/script.php'">
        FcgidOutputBufferSize 0
    </If>
</IfModule>

answered Aug 17, 2016 at 23:29

Cave Johnson

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4 Comments

Shawn Over a year ago

What if I only need this for a specific function in the script?

Cave Johnson Over a year ago

@Shawn Sorry I don't know how to do that. Hopefully someone else who knows can answer.

Shawn Over a year ago

cPanel keeps throwing me syntax error with your solution. Any idea?

Cave Johnson Over a year ago

@Shawn I'm not sure why there is a syntax error. I used this page as a reference: httpd.apache.org/docs/current/expr.html#examples. It looks like it should work. The error doesn't give you any more detail?

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