(PHP 5)
time_nanosleep — Delay for a number of seconds and nanoseconds
   Delays program execution for the given number of
   seconds and nanoseconds.
  
secondsMust be a non-negative integer.
nanosecondsMust be a non-negative integer less than 1 billion.
   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:
| Version | Description | 
|---|---|
| 5.3.0 | This function is now available on Windows platforms. | 
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.";
}
?>