How to solve the problem of php flush failure under nginx

Problem

When I was debugging PHP line-by-line output, I found that both ob_flush and flush failed. I can basically judge the settings of php.ini through phpinfo. normal.

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Solution

Looking at Nginx again, I found that there are the following settings in Nginx:

fastcgi_buffer_size 128k;
fastcgi_buffers 8 128k;

The problem is basically found. Nginx will buffer the information output by PHP. When it reaches 128k, the buffer data will be sent to the client. Then we first need to reduce the buffer size, such as:

fastcgi_buffer_size 4k;
fastcgi_buffers 8 4k;

And, gzip

gzip off;

Then, in php, before ob_flush and flush, output a piece of content reaching 4k, for example:

echo str_repeat(‘ ‘, 1024*4);

At this point, PHP The required content can be output line by line through ob_flush and flush normally.

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