php - Symfony/Process 因异常而失败

Question

我正在尝试使用 Symfony/Process 组件为 linux 执行独立的 chromedriver。这是项目的文件夹结构：

 .
 ├── bin
 │   └── chromedriver-linux
 ├── composer.json
 ├── index.php
 └── vendor

这index.php是我要执行的代码：

<?php

require 'vendor/autoload.php';

use Symfony\Component\Process\Process;

$process = new Process(
    [realpath(__DIR__.'/bin/chromedriver-linux')], null, ['DISPLAY' => ':0']
);

$process->start();

if (!$process->isSuccessful()) {
    throw new \Symfony\Component\Process\Exception\ProcessFailedException($process);
}

然而情况变得更糟了。现在没有错误输出，它只是抛出一个异常，如：

Fatal error: Uncaught Symfony\Component\Process\Exception\ProcessFailedException: The command "'/home/vagrant/Code/development/test-project/bin/chromedriver-linux'" failed. Exit Code: () Working directory: /home/vagrant/Code/development/dusk-2.0 Output: ================ Error Output: ================ in /home/vagrant/Code/development/test-project/index.php on line 14