Delay for a number of seconds and nanoseconds

# time_nanosleep

(PHP 5, PHP 7, PHP 8)

time_nanosleep — Delay for a number of seconds and nanoseconds

### Description

time_nanosleep(int `$seconds`, int `$nanoseconds`): array|bool

Delays program execution for the given number of `seconds` and `nanoseconds`.

### Parameters

`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.

### Return Values

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

### Examples

Example #1 time_nanosleep() example

`<?php
// Careful! This won't work as expected if an array is returned
if (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.";
}
?>`

### See Also

- sleep() - Delay execution
- usleep() - Delay execution in microseconds
- time_sleep_until() - Make the script sleep until the specified time
- set_time_limit() - Limits the maximum execution time

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