(PHP 5, PHP 7, PHP 8)
time_nanosleep — Delay for a number of seconds and nanoseconds
Delays program execution for the given number of
seconds
and nanoseconds
.
seconds
Must be a non-negative integer.
nanoseconds
Must be a non-negative integer less than 1 billion.
Note: On Windows, the system may sleep longer that the given number of nanoseconds, depending on the hardware.
Returns true
on success or false
on failure.
If the delay was interrupted by a signal, an associative array will be returned with the components:
seconds
- number of seconds remaining in
the delay
nanoseconds
- number of nanoseconds
remaining in the delay
Example #1 time_nanosleep() example
<?php// Careful! This won't work as expected if an array is returnedif (time_nanosleep(0, 500000000)) { echo "Slept for half a second.\n";}// This is better:if (time_nanosleep(0, 500000000) === true) { echo "Slept for half a second.\n";}// And this is the best:$nano = time_nanosleep(2, 100000);if ($nano === true) { echo "Slept for 2 seconds, 100 microseconds.\n";} elseif ($nano === false) { echo "Sleeping failed.\n";} elseif (is_array($nano)) { $seconds = $nano['seconds']; $nanoseconds = $nano['nanoseconds']; echo "Interrupted by a signal.\n"; echo "Time remaining: $seconds seconds, $nanoseconds nanoseconds.";}?>