Output_buffering, how to solve

Output_buffering
Look at the buffer, there are many questions.
Comments from senior Members
I opened php.ini to see

; Output_buffering
; Default Value:off
; Development value:4096
; Production value:4096

Output_buffering, this one's commented out.
As I understand it, there's no buffer to start PHP.

But I wrote it in the program.

echo "123123";
Ob_end_clean ();

There's no output to the page.
Which means that Echo was written to the buffer first.
And then he was killed by Ob_end_clean.


My problem is, if it's commented out,
is the buffer open or closed??? Is it related to the environment?

------Solution--------------------
Output_buffering = 4096

Are you sure you have a comment???
This option is turned on by default in php.ini unless you manually modify it.
I'm going to post this comment off.

Echo 123;
Ob_end_clean ();

Will output 123 immediately and prompt Notice:ob_end_clean (): Failed to delete buffer. No buffer to delete in/users/angryfrog/website/test.php on line 3.

No buffer can be removed, that is, no buffering is turned on at all.
Not output 123 unless Ob_start () is added to the head.

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