(PHP 4, PHP 5, PHP 7, PHP 8)
ob_end_flush — Flush (send) the return value of the active output handler and turn the active output buffer off
   This function calls the output handler
   (with the PHP_OUTPUT_HANDLER_FINAL flag),
   flushes (sends) it's return value,
   discards the contents of the active output buffer
   and turns off the active output buffer.
  
   ob_end_flush() will fail
   without an active output buffer started with the
   PHP_OUTPUT_HANDLER_REMOVABLE flag.
  
   ob_end_flush() will flush (send)
   the return value of the output handler
   even if the active output buffer was started without the
   PHP_OUTPUT_HANDLER_FLUSHABLE flag.
  
This function has no parameters.
   If the function fails it generates an E_NOTICE.
  
Example #1 ob_end_flush() example
The following example shows an easy way to flush and end all output buffers:
<?php
  while (@ob_end_flush());
?>