What are the “serious performance implications” of implicit_flush?
问题 My site's admin section has a bunch of very slow report-generating scripts that echo output line by line as it is generated. To have this output flushed immediately to the browser, instead of the user having to wait for minutes before they see any response, we have output_buffering disabled and we call ob_implicit_flush at the beginning of such scripts. For convenience, I was considering just turning on the implicit_flush setting in php.ini instead of adding ob_implicit_flush() calls to every