Ob_flush () and flush () and Ob_implicit_flush (true)

Http://www.jb51.net/article/16215.htm

First

The difference between ob_flush () and flush (). The former is the release of data from the buffer of PHP, the latter is not buffered or released data sent to the browser. So when the buffers are present, we have to use both ob_flush () and flush (). The correct use order is: first with Ob_flush (), followed by flush ().

Second

(When you set the php.ini output_buffering to 0, even Ob_flush () and Ob_end_clean () are not required)

Third

Note that Ob_implicit_flush (true), this function forces the output to be sent to the browser whenever there is an output. This does not require each output (echo) to be sent to the browser with flush ().

Ob_flush () and flush () and Ob_implicit_flush (true)