Why does the time() function run in a loop return the same value?

Question

Laravel

Elementary code:

for ($i = 0; $i < 20; $i++){
            echo time() . '<br>';
        }

Here is the output:

Version php7. Why is this happening? after all polzhno to return different value. Local project.
And here is what I want to do:

foreach ($files as $file) {
            $name = time();
            $file->move(public_path('upload/' . $path_name . '/' . $id), $name . '.' . $file->getClientOriginalExtension());
        }

Answer 1

1.microtime(true);
2. do not do this. Suddenly 2 files will load at the same time. Name the hash of the file

Answer 2

Enjoy:

for ($i = 0; $i < 20; $i++){
    echo time() . '<br>';
    sleep(1);
}

Answer 3

It's hard to guess that the loop takes milliseconds?
Write microtime(true) - check out the difference.

Answer 4

RTFM: tempnam

Answer 5

Returns the number of seconds that have elapsed since the beginning of the Unix Epoch (The Unix Epoch, January 1, 1970 00:00:00 GMT) until the current time.
Apparently this number has not changed.