(PHP 5 >= 5.3.0)
pcntl_signal_dispatch — Calls signal handlers for pending signals
The pcntl_signal_dispatch() function calls the signal handlers installed by pcntl_signal() for each pending signal.
如果成功则返回 TRUE，失败则返回 FALSE。
Example #1 pcntl_signal_dispatch() example
<?php
echo "Installing signal handler...\n";
pcntl_signal(SIGHUP, function($signo) {
echo "signal handler called\n";
});
echo "Generating signal SIGHUP to self...\n";
posix_kill(posix_getpid(), SIGHUP);
echo "Dispatching...\n";
pcntl_signal_dispatch();
echo "Done\n";
?>
上例的输出类似于：
Installing signal handler... Generating signal SIGHUP to self... Dispatching... signal handler called Done