所以我有这段代码，我只是想在另一个目录中列出保存列表，其中 php 脚本位于 xampp 文件夹中，并且保存到此路径 /root/files/saves:
So I have this code and I'm only trying to make a list of the saves in another directory where the php scrip is in xampp folder and the saves are to this path /root/files/saves:
<html>
<body>
<?php
$output = shell_exec('ls /root/files/saves');
echo "<pre>$output</pre>";
?>
</body>
</html>
我不知道为什么我不能让它在 var_dump 上运行它似乎输出为空我真的很困惑它应该工作或者我完全错了我需要一些帮助.
I don't know why I can't get it working on a var_dump it seems output is null I'm really confuse it should work or I just it all wrong I need some help.
将 2>&1 添加到您的 shell 命令的末尾以使 STDERR 也返回作为 STDOUT.
Add 2>&1 to the end of your shell command to have STDERR returned as well as STDOUT.
$output = shell_exec("ls /root/files/saves 2>&1");
另外，如果运行 PHP 的用户没有足够的权限查看 /root/ 中的输出，上述代码将返回 Permission denied 错误消息.
Also, if the user running PHP doesn't have sufficient permissions to view the output in /root/, the above code will return a Permission denied error message.
来源:http://php.net/manual/en/function.shell-exec.php#28994
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