Working With Output Handlers
When invoked, output handlers are passed the contents of the buffer
and a bitmask indicating the status of output buffering.
string
handler
(
string
$buffer
,
int
$phase
= ?)
-
buffer
-
Contents of the output buffer.
-
phase
-
Bitmask of
PHP_OUTPUT_HANDLER_*
constants
.
Warning
Calling any of the following functions from within an output handler
will result in a fatal error:
ob_clean, ob_end_clean,
ob_end_flush, ob_flush,
ob_get_clean, ob_get_flush,
ob_start.
Note:
If the PHP_OUTPUT_HANDLER_DISABLED of a handler is set,
the handler will not be invoked by calling
ob_end_clean, ob_end_flush,
ob_get_clean, ob_get_flush,
ob_clean,
ob_flush
or during PHP's shutdown process.
Prior to PHP 8.4.0, this flag had no effect when calling ob_clean
or ob_flush.
Note:
The working directory of the script can change inside the shutdown function
under some web servers, e.g. Apache or the built-in web server.