fflush

Function • Params and return types changed in PHP 8.0

Flushes the output to a file.

PHP 5

PHP 7

Improved

PHP 8.1

PHP 8.2-8.3

PHP 8.4

PHP 8.5

PHP 8.6

`fflush` Function synopsis

fflush($stream): bool

Parameters

`$stream`

Return value

Typebool

Returns true on success, false on failure

Changes to the `fflush` Function

PHP 8.0

Return type added: bool
Parameter name of parameter #1 changed: $fp to $stream

- fflush($fp)
+ fflush($stream): bool

`fflush` Function Availability

PHP Version	Availability
PHP 8.6Upcoming Release	Yes
PHP 8.5Supported (Latest)	Yes
PHP 8.4Supported	Yes
PHP 8.3Security-Fixes Only	Yes
PHP 8.2Security-Fixes Only	Yes
PHP 8.1Unsupported	Yes
PHP 8.0Unsupported	Yes
PHP 7.4Unsupported	Yes
PHP 7.3Unsupported	Yes
PHP 7.2Unsupported	Yes
PHP 7.1Unsupported	Yes
PHP 7.0Unsupported	Yes
PHP 5.6Unsupported	Yes
PHP 5.5Unsupported	Yes
PHP 5.4Unsupported	Yes
PHP 5.3Unsupported	Yes