header_register_callback

Function • Params and return types changed in PHP 8.0

Call a header function.

PHP 5.3
PHP 5.4
Added
PHP 5.5-5.6
PHP 7
PHP 8.0
Improved
PHP 8.1
PHP 8.2-8.3
PHP 8.4
PHP 8.5
PHP 8.6

header_register_callback Function synopsis

header_register_callback(callable $callback): bool

Parameters

$callback

Typecallable

Function called just before the headers are sent. It gets no parameters and the return value is ignored.

Return value

Typebool

Returns true on success, false on failure

Changes to the header_register_callback Function

PHP 8.0

  • Return type added: bool
  • Parameter type added for parameter #1 ($callback): callable
- header_register_callback($callback)
+ header_register_callback(callable $callback): bool

PHP 5.4

  • Function added

header_register_callback Function Availability

PHP VersionAvailability
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 No