从列表中删除密钥

Question

我正在开发一个销售软件许可证密钥的小功能。基本上它的作用是从 txt 中获取密钥，然后获取密钥并删除文件，重写它但没有出售的密钥。不过我有一个问题。谁能帮我发现错误并帮助我修复它？

file.txt 内容：

KEY1, KEY2, KEY3, KEY4, KEY5

我的班级：

class Key {

 public static function getRandomKey($keyset)
 {
    $i = rand(0, count($keyset));
    return $keyset[$i];
 }

}

我的功能：

$file = 'file.txt';
$contents = file_get_contents($file);
$contents = str_replace(' ', '', $contents);
$keyset = explode(',', $contents);
$key = Key::getRandomKey($keyset);
echo $key;
$str = implode(',', $keyset);
unlink($file);
$rfile = fopen($file, 'w');
fwrite($rfile, $str);
fclose($rfile);

Answer 1

我支持@andrewsi's comment，但您想要实现这一目标的一般流程是这样的：

// fetch
$keys = file_get_contents('your_keys.txt');
// explode
$list = explode(",", $keys);
// get random key (this would be your Key::getRandomKey() function)
$use = rand(0, (count($list) - 1)); // notice how we do count($list) - 1? Since the index starts at 0, not 1, you need to account for that ;-)

// now get a key
echo $list[$use];
// unset that key from the list
unset($list[$use]);
// implode the keys again
$keys = implode(", ",$list);
// and save it to the file
file_put_contents('your_keys.txt', $keys);

Example/Demo