PHP进程信号处理

<?php
while (1)
 {
     echo "I am doing something important\n";    
     echo "If i am interruptted, the data will be corrupted\n";    
     echo "Be careful\n";    
     echo "\n\n";
    sleep(5);
}

<?php/**
 * 信号ID和信号名称对应关系，没注释掉的信号都是可以通过pcntl_signal函数注册的
 */
 $GLOBALS['G_SIG_MAP'] = array(
     1 => 'SIGHUP',    
     2 => 'SIGINT',    
     3 => 'SIGQUIT',    
     4 => 'SIGILL',    
     5 => 'SIGTRAP',    
     6 => 'SIGABRT',    
     7 => 'SIGEMT',    
     8 => 'SIGFPE',    
     //9 => 'SIGKILL',
    10 => 'SIGBUS',    
    11 => 'SIGSEGV',    
    12 => 'SIGSYS',    
    13 => 'SIGPIPE',    
    14 => 'SIGALRM',    
    15 => 'SIGTERM',    
    16 => 'SIGURG',    
    //17 => 'SIGSTOP',
    18 => 'SIGTSTP',    
    19 => 'SIGCONT',    
    20 => 'SIGCHLD',    
    21 => 'SIGTTIN',    
    22 => 'SIGTTOU',    
    23 => 'SIGIO',    
    24 => 'SIGXCPU',    
    25 => 'SIGXFSZ',    
    26 => 'SIGVTALRM',    
    27 => 'SIGPROF',    
    28 => 'SIGWINCH',    
    29 => 'SIGINFO',    
    30 => 'SIGUSR1',    
    31 => 'SIGUSR2',
);
/**
 * 进程信号处理函数
 * @param int $signo 信号ID
 */function signalHandler($signo) {
    if (isset($GLOBALS['G_SIG_MAP'][$signo])) {  
    echo "Caught signal {$GLOBALS['G_SIG_MAP'][$signo]}, exit\n";
    } else {      
              echo "Caught unknown signal:$signo";
    }    
    exit();
}foreach ($GLOBALS['G_SIG_MAP'] as $id => $name) {
    pcntl_signal($id, 'signalHandler');
}while (1) {
                echo "I am doing something important\n";    
                echo "If i am interruptted, the data will be corrupted\n";    
                echo "Be careful\n";    echo "\n\n";
    pcntl_signal_dispatch(); // 此函数调用必须放在循环体内
    sleep(5);
}