usleep

Function • Params and return types changed in PHP 8.0

Delay execution in microseconds.

PHP 5

PHP 7

Improved

PHP 8.1

PHP 8.2-8.3

PHP 8.4

PHP 8.5

PHP 8.6

`usleep` Function synopsis

usleep(int $microseconds): void

Parameters

`$microseconds`

Typeint

Halt time in microseconds. A microsecond is one millionth of a second.

Return value

The usleep function is a void function; it does not return any values.

Changes to the `usleep` Function

PHP 8.0

Return type added: void
Parameter name of parameter #1 changed: $micro_seconds to $microseconds
Parameter type added for parameter #1 ($microseconds): int

- usleep($micro_seconds)
+ usleep(int $microseconds): void

`usleep` 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