In cases where the system command in PHP returns an empty array, what troubleshooting steps can be taken to identify and resolve the issue, especially considering differences in system setups?

When the system command in PHP returns an empty array, it could be due to various reasons such as incorrect command syntax, permission issues, or the command not producing any output. To troubleshoot this, you can check the command syntax, ensure the command has the necessary permissions to execute, and verify that the command is expected to return output. Additionally, you can try running the command directly in the terminal to see if it produces the expected output.

// Example code snippet to troubleshoot and handle empty array returned by system command
$command = 'your_command_here';
$output = [];
exec($command, $output);

if (empty($output)) {
    echo 'Empty array returned by system command. Check command syntax, permissions, and expected output.';
} else {
    // Process the output array as needed
    foreach ($output as $line) {
        echo $line . PHP_EOL;
    }
}