使用事件

use Symfony\Component\Console\Application;
use Symfony\Component\EventDispatcher\EventDispatcher;
 
$dispatcher = new EventDispatcher();
 
$application = new Application();
$application->setDispatcher($dispatcher);
$application->run();

use Symfony\Component\Console\Event\ConsoleCommandEvent;
use Symfony\Component\Console\ConsoleEvents;
 
$dispatcher->addListener(ConsoleEvents::COMMAND, function (ConsoleCommandEvent $event) {
    // get the input instance / 取得input实例
    $input = $event->getInput();
 
    // get the output instance / 取得output实例
    $output = $event->getOutput();
 
    // get the command to be executed / 取得将要执行的命令
    $command = $event->getCommand();
 
    // write something about the command / 写入和命令有关的内容
    $output->writeln(sprintf('Before running command <info>%s</info>', $command->getName()));
 
    // get the application / 获取application
    $application = $command->getApplication();
});

use Symfony\Component\Console\Event\ConsoleCommandEvent;
use Symfony\Component\Console\ConsoleEvents;
 
$dispatcher->addListener(ConsoleEvents::COMMAND, function (ConsoleCommandEvent $event) {
    // get the command to be executed / 取得将要执行的命令
    $command = $event->getCommand();
 
    // ... check if the command can be executed
    // ... 检查命令是否可以被执行
 
    // disable the command, this will result in the command being skipped
    // and code 113 being returned from the Application
    // 禁用命令，将导致命令被跳过，并从Application中返回113 code。
    $event->disableCommand();
 
    // it is possible to enable the command in a later listener
    // 也可以在后面的监听中开启命令
    if (!$event->commandShouldRun()) {
        $event->enableCommand();
    }
});

use Symfony\Component\Console\Event\ConsoleExceptionEvent;
use Symfony\Component\Console\ConsoleEvents;
 
$dispatcher->addListener(ConsoleEvents::EXCEPTION, function (ConsoleExceptionEvent $event) {
    $output = $event->getOutput();
 
    $command = $event->getCommand();
 
    $output->writeln(sprintf('Oops, exception thrown while running command <info>%s</info>', $command->getName()));
 
    // get the current exit code (the exception code or the exit code set by a ConsoleEvents::TERMINATE event)
    // 获取当前的退出码（异常代码或是退出码的设置，是通过ConsoleEvents::TERMINATE事件来完成）
    $exitCode = $event->getExitCode();
 
    // change the exception to another one / 把异常改为另一个
    $event->setException(new \LogicException('Caught exception', $exitCode, $event->getException()));
});

use Symfony\Component\Console\Event\ConsoleTerminateEvent;
use Symfony\Component\Console\ConsoleEvents;
 
$dispatcher->addListener(ConsoleEvents::TERMINATE, function (ConsoleTerminateEvent $event) {
    // get the output / 获取output
    $output = $event->getOutput();
 
    // get the command that has been executed / 获取已被执行的命令
    $command = $event->getCommand();
 
    // display something / 显示内容
    $output->writeln(sprintf('After running command <info>%s</info>', $command->getName()));
 
    // change the exit code / 改变退出码
    $event->setExitCode(128);
});