The definition should mention that the function also "turns off output buffering", not just cleans it.
ob_get_clean
(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
ob_get_clean — Get the contents of the active output buffer and turn it off
Descrizione
This function calls the output handler
(with the PHP_OUTPUT_HANDLER_CLEAN and
PHP_OUTPUT_HANDLER_FINAL flags),
discards it's return value,
returns the contents of the active output buffer
and turns off the active output buffer.
ob_get_clean() will fail
without an active output buffer started with the
PHP_OUTPUT_HANDLER_REMOVABLE flag.
ob_get_clean()
will discard the contents of the active output buffer
even if it was started without the
PHP_OUTPUT_HANDLER_CLEANABLE flag.
Elenco dei parametri
Questa funzione non contiene parametri.
Valori restituiti
Returns the contents of the active output buffer on success
or false on failure.
Attenzione
ob_get_clean() will return false
but will not generate an E_NOTICE
if there is no active output buffer.
Errori/Eccezioni
If the function fails it generates an E_NOTICE.
Esempi
Example #1 A simple ob_get_clean() example
<?php
ob_start();
echo "Hello World";
$out = ob_get_clean();
$out = strtolower($out);
var_dump($out);
?>Il precedente esempio visualizzerà:
string(11) "hello world"
Vedere anche:
- ob_start() - Turn on output buffering
- ob_get_contents() - Return the contents of the output buffer
- ob_clean() - Clean (erase) the contents of the active output buffer
- ob_end_clean() - Clean (erase) the contents of the active output buffer and turn it off
- ob_get_flush() - Flush (send) the return value of the active output handler, return the contents of the active output buffer and turn it off
add a note
User Contributed Notes 6 notes
geo dot artemenko at gmail dot com ¶
10 years ago
steven at bielik dot com ¶
13 years ago
Also, don't forget that you will need to ob_start() again for any successive calls:
<?php
ob_start();
echo "1";
$content = ob_get_clean();
ob_start(); // This is NECESSARY for the next ob_get_clean() to work as intended.
echo "2";
$content .= ob_get_clean();
echo $content;
?>
Output: 12
Without the second ob_start(), the output is 21 ...
paul+phpnet at earth2me dot com ¶
11 years ago
Keep in mind that output may be buffered by default, depending on how you are running PHP (CGI, CLI, etc.). You can use ob_get_level() to determine if an output buffer has already been started. On most web servers I've used, output buffering is already one level deep before my scripts start running.
You should only end as many output buffers as you start. Assuming that your buffer is always the first buffer, or otherwise closing pre-existing buffers, could lead to problems. In PHP 5.5, you can ensure that output buffers are ended properly using a try-finally block.
Something like this is almost guaranteed to break stuff:
<?php
// Don't ever do this!
while (ob_get_level() > 1)
{
ob_end_flush();
}
$content = ob_get_clean();
?>
The problem is that number, "1". Using a fixed number there is asking for trouble. Instead, use ob_get_level() to get the number of output buffers applied when your code starts, and return to that number, if you really must use an unknown number of output buffers:
<?php
ob_start();
$saved_ob_level = ob_get_level();
// Do stuff here:
run_something();
// If you really must close all of your output buffers except one, this'll do it:
while (ob_get_level() > $start_ob_level)
{
ob_end_flush();
}
// And now, the final output buffer that belongs to us:
$content = ob_get_clean();
?>
sergei dot solomonov at gmail dot com ¶
12 years ago
<?php
ob_start();
echo "1";
$content = ob_get_clean();
echo "2";
$content .= ob_get_clean();
echo $content;
?>
This script outputs 21 in CLI mode and 12 otherwise (under my apache and nginx)
Peter Smartt ¶
7 years ago
I was trying to debug my code using error_log() and I discovered that ob_get_clean() also truncates the error_log() buffer right in the middle of its output, and well as the output buffer which it is supposed to truncate. If you are using error_log(), use ob_get_contents() and ob_end_clean() instead of ob_get_clean().
ludvig dot ericson at gmail dot com ¶
19 years ago
Notice that the function beneath does not catch errors, so throw in an @ before those ob_* calls
