PHP脚本不起作用

Question

Basically, I want to run below script locally in order start stop restart and get status of service. And it must show output of each command button. I am using php 5.6 in order to run this code.

Below is the code:

<?php
    // define cmds
    $commands = [
    'stop_apache' => [
        'description' => 'Stop Apache2',
        'cmd' => 'systemctl stop apache2'
    ],
    'restart_apache' => [
        'description' => 'Restart Apache2',
        'cmd' => 'systemctl restart apache2'
    ],
    'start_apache' => [
        'description' => 'Start Apache2',
        'cmd' => 'systemctl start apache2'
    ],
    'status_apache' => [
        'description' => 'Status Apache2',
        'cmd' => 'systemctl status apache2'
    ],
    ];

    // handle post
    if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $error = [];
    $result = '';

    // validate input
    if (empty($_POST['service'])) {
        $error = [
            'service' => 'Service type required!'    
        ];
    } elseif (!array_key_exists($_POST['service'], $commands)) {
        $error = [
            'service' => 'Invalid Service!'    
        ];
    }
    }
    ?>
    <form action="" method="post">
    <?php if (!empty($error)): ?>
    <h3>Error</h3>
    <pre><?= print_r($error, true) ?></pre>
    <?php endif ?>
    <?php foreach ($commands as $key => $command): ?>
    <button type="submit" name="service" value="<?= $key ?>"><?= 
    $command['description'] ?></button>
    <?php endforeach ?>
    </form>
   <?php if (!empty($result)): ?>
   <pre><?= print_r($result, true) ?></pre>
   <?php endif ?>

Answer 1

// handle post
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$error = [];
$result = '';

// validate input
if (empty($_POST['service'])) {
    $error = [
        'service' => 'Service type required!'    
    ];
} elseif (!array_key_exists($_POST['service'], $commands)) {
    $error = [
        'service' => 'Invalid Service!'    
    ];
}
//you need add this line
else $result = $commands[$_POST['service']];
}