How to listen to a file in realtime?

Question

linux

Actually, the user data is written to the file using the utility. On the same server, I wrote an api that accepts logs. Is it possible to somehow implement that with each update of the file, or even simply, without a file, send data to the address of my api?

Answer 1

for a file, the simplest option would be to implement behavior similar to the tail utility, or call tail and take the output from it

$handle = popen("tail -f /path/to/my/logfile.log 2>&1", 'r');

while(!feof($handle)) {
    $buffer = fgets($handle);
    // здесь будет вызов API
    ob_flush();
    flush();
}
pclose($handle);

Answer 2

Well, at least the question was answered, but I'll add it. Linux has an inotify subsystem that allows you to monitor a file in real time - https://en.wikipedia.org/wiki/Inotify