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(PHP 4, PHP 5, PHP 7, PHP 8)

ob_end_flush Descarrega (envia) o buffer de saída e desativa o buffer de saída


ob_end_flush(): bool

Esta função irá enviar o conteúdo do buffer mais em cima (se existir algum) e desativar o buffer de saída. Se você quiser processar o conteúdo do buffer você deverá utilizar ob_get_contents() antes de ob_end_flush() já que o conteúdo do buffer é discartado após ob_end_flush(). A função retorna true quando é bem sucedida em discartar um buffer, false se não. Razões para falhar é primeiro que você utilizou a função sem um buffer ativo ou por algum motivo o buffer não pode ser excluído (possivelmente por um buffer especial).

Nota: Esta função é que parecida com ob_get_flush(), exceto que ob_get_flush() retorna o buffer como uma string.

O exemplo a seguir mostra como descarregar e terminar com todos os buffers de saída:

Exemplo #1 Exemplo ob_end_flush()

while (@ob_end_flush());

Nota: Se a função falhar gera um E_NOTICE. O valor booleano de rtorno foi adicionado no PHP 4.2.0.

Veja também ob_start(), ob_get_contents(), ob_get_flush(), ob_flush() e ob_end_clean().

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User Contributed Notes 9 notes

jhannus at 128kb dot com
19 years ago
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.


while (ob_get_level() > 0) {

nico (at)
10 years ago
best way to compress a css code:

('Content-type: text/css');

compress($buffer) {
// remove comments
$buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer);
// remove tabs, spaces, newlines, etc.
$buffer = str_replace(array("\r\n", "\r", "\n", "\t", '  ', '    ', '    '), '', $buffer);



Include in <head>:
<link rel="stylesheet" type="text/css" href="/design.php" media="all" />
skippy at zuavra dot net
17 years ago
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.
brett at realestate-school dot com
20 years ago
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.
12 years ago
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):

(); // 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!
// now flush output output to client
// need to calculate content length *after* URL rewrite!
header("Content-length: ".ob_get_length());
// now we close the session and do some arbitrary clean-up tasks
// registered using register_shutdown_function()
anatoliy at miraline dot com
12 years ago
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.
kriek at jonkriek dot com
20 years ago
ob_end_flush() isn't needed in MOST cases because it is called automatically at the end of script execution by PHP itself when output buffering is turned on either in the php.ini or by calling ob_start().
13 years ago
It appears that ob_end_flush() is very important if you are looping.  For instance if you are using a mass mailer that uses the output buffer for creating HTML content.  Use ob_end_flush() to avoid server errors.
13 years ago
Remember that chromium browser (and maybe other webkit-based browsers) have some issues with ob_end_flush.

You may use
header("Content-Type: text/plain");
to solve those issues if you do not need html.
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