从 TXT 文件中提取随机行作为字符串

I'm currently using the code below to try and read a random line from random.txt and pass it as $data, however it comes back empty. Each string has its own line, am I missing something here? Shouldn't this work? If not how can I get a random line from my text file and use it as my $data string?

$f_contents = file("random.txt");
$line = $f_contents[array_rand($f_contents)];
$data = $line;

已解决 - 错误的 CHMOD以为我已经仔细检查过了，很抱歉提出问题.