Technical FAQ
PHP Manual
CSS2 Manual
HTML Manual
JS Guide
JS Reference
PhpDock Manual
Nu-Coder Manual
PhpExpress Manual
PHP Joomla
Learn PHP
Last updated: Tue, 19 Sep 2006


(PHP 5)

time_nanosleep --  Delay for a number of seconds and nanoseconds


mixed time_nanosleep ( int seconds, int nanoseconds )

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

seconds must be a positive integer, and nanoseconds must be a positive integer less than 1 billion.

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


Example 1. time_nanosleep() example

// 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 ($nano === true) {
    echo "Slept for 2 seconds, 100 milliseconds.\n";
} elseif ($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.";

Note: This function is not implemented on Windows platforms.

Last updated: Tue, 19 Sep 2006