(PHP 4, PHP 5, PHP 7, PHP 8)
ob_end_flush — Сбрасывает (отправляет) значение, которое вернул активный обработчик вывода, и отключает активный буфер вывода
Функция вызывает обработчик вывода
с флагом PHP_OUTPUT_HANDLER_FINAL,
сбрасывает (отправляет) значение, которое вернул обработчик,
отбрасывает содержимое активного буфера вывода
и отключает активный буфер.
Функция ob_end_flush() завершится ошибкой,
если активный буфер вывода запустили без флага
PHP_OUTPUT_HANDLER_REMOVABLE.
Функция ob_end_flush() сбросит (отправит) значение,
которое вернулось из обработчика вывода,
даже если активный буфер вывода запустили без флага
PHP_OUTPUT_HANDLER_FLUSHABLE.
У этой функции нет параметров.
Функция возвращает true, если выполнилась успешно, или false, если возникла ошибка.
Функция генерирует ошибку уровня E_NOTICE, если возникла ошибка.
Пример #1 Пример сброса и отключения активного буфера вывода функцией ob_end_flush()
Следующий пример показывает простой способ сброса и завершения всех буферов вывода:
<?php
while (@ob_end_flush());
?>
A note on the above example...with PHP 4 >= 4.2.0, PHP 5 you can use a combination of ob_get_level() and ob_end_flush() to avoid using the @ (error suppresion) which should probably be a little faaster.<?phpwhile (ob_get_level() > 0) { ob_end_flush();}?>best way to compress a css code:<?php header('Content-type: text/css'); ob_start("compress"); function compress($buffer) { // remove comments $buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer); // remove tabs, spaces, newlines, etc. $buffer = str_replace(array("\r\n", "\r", "\n", "\t", ' ', ' ', ' '), '', $buffer); return $buffer; } include('./template/main.css'); include('./template/classes.css');<?php ob_end_flush();?>Include in <head>:<link rel="stylesheet" type="text/css" href="/design.php" media="all" />If you enable zlib.output_compression then level count will be increased by 1 and then this code:
<?php while (ob_get_level()) { ob_end_clean(); } ?>
will just freeze your script.Wanted to speed things up and put some processing after the page has been delivered to the client. That drove me almost insane, but finally, I found a solution (php 5.2.5):
<?php
ob_start(); // outer buffer
ob_start(); // inner buffer to catch URL rewrites and other post processing
session_start(); // registers URL rewriter with inner buffer!
echo '...';
// log performance data to log files *after* delivering the page!
register_shutdown_function(array($benchmarkclass,'log_perf_data'));
// now flush output output to client
ob_end_flush();
// need to calculate content length *after* URL rewrite!
header("Content-length: ".ob_get_length());
ob_end_flush();
// now we close the session and do some arbitrary clean-up tasks
// registered using register_shutdown_function()
session_write_close();
?>Apart from being mostly redundant, ob_end_flush() can be downright damaging in some weird cases.Actual example: a particular page on an Intranet website which would appear blank on Internet Explorer 6 when ob_start('ob_gzhandler') was called in the beginning and ob_end_flush() at the end.We couldn't figure out what made that page special no matter what we tried. The ob_ functions were placed in scripts which were include()'d by all pages just the same, but only that page did this.Even stranger, the problem only appeared on direct browser/server connections. Whenever the connection passed through a proxy the problem dissapeared. I'm guessing some kind of HTTP encoding headers mumbo-jumbo.Solution: unless you really need it in particular cases, remove the ob_end_flush() call and rely on the builtin, automatic buffer flush.It appears that you can call ob_end_flush() regardless of whether or not output buffering was ever started using ob_start(). This can prove useful because it saves you from having to create conditional statements based on whether a particular function or include file has started output buffering. You can simply call the ob_end_flush() anyway and if there's output in the buffer, it will be sent, otherwise your script will just keep on keepin' on.