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<?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."; } ?>