The text file may not be the best storage, but it will come down for learning.
The first step is to come up with a format for storing data in a file. These may just be id separated by a character that will never appear in id. Let it be a newline character \n , for example.
Further, to search in already recorded id, their values must be read:
$idsFile = __DIR__ . '/user_id.txt'; $idsStr = file_get_contents($idsFile); $ids = array_filter(explode("\n", $idsStr)); var_dump($ids);
Accordingly, it is possible to check that the id is already among the previously saved id using the array_search function. If the user is not yet in the list and Subscription, then add him to the $ids array, if the Unsubscribe and the user are in the array, then delete:
$pos = array_search($user_id, $ids); switch ($user_msg) { case 'Подписка': if ($pos === false) { $ids[] = $user_id; $v->msgSend("$user_name, спасибо что подписались на рассылку записей. Для отписки используй команду: Отписка.", $user_id, $access_token); } else { $v->Send("$user_name, ты уже подписан на рассылку!", $user_id, $access_token); } break; case 'Отписка': if ($pos !== false) { unset($ids[$pos]); $v->msgSend("Вы успешно отписались от «Рассылки постов»!", $user_id, $access_token); } else { $v->msgSend("$user_name, вы не можете отписаться от рассылки, так как вы не были подписаны на неё.", $user_id, $access_token); } break; case 'привет': case 'хай': case 'ку': // break; }
Well, it remains to save the $ids array to the file:
file_put_contents($idsFile, implode("\n", $ids));
However, this method has many disadvantages.
- Multiple simultaneous requests can mismatch data in a file. For example, for one request, the script will read the file and add id 123, but will not have time to write the changes to the file. And at this time for the second request the file will be read (without 123) and id 456 will be added to it. Now the first handler will write the file with 123, and then the second handler with 456. Thus, there will not be a 123 record in the file (it will be overwritten by the second handler) .
- Reading and searching a large file can take considerable time.
These problems are well known and solutions for them have long been invented. To ensure consistency of data, locks are used (while one is working with the file, the others are waiting). To speed up the search, indexes are used (this is like an alphabetical index in a book; it allows you not to scroll all over again, but to immediately open the necessary page).
Implementing locks and indexes can be quite a challenge for a beginner and quite boring for a highly experienced developer, but there is a ready-made solution! This is a database. The easiest option could be SQLite , you need to master PDO to work with it. The ability to work with databases will not only help you in a task with a bot, but will also be very useful in the future.
