Php加入字符串而不保存文件

Question

I have php function like this at start of my code:

<?php
session_start();

if(empty($_SESSION['visited'])) {
    $counter = file_get_contents('../visitCount.txt') + 1;
    file_put_contents('../visitCount.txt', $counter);

    $date = date('d/m/Y');
    $dailyCounter = file_get_contents("../visitCount_" . $date . ".txt") + 1;
    file_put_contents("../visitCount_" . $date . ".txt", $dailyCounter);
}
$_SESSION['visited'] = TRUE;

As you can see what I want to do is have file with name visitCount_XX/XX/XXXX.txt but problem is that file is not appearing (saving) but first one (with static name does).

I have tried changing '' to "" just like it is in example now. I have typed echo($date); after everything and it shows me correct date. Why it Is not working?

Answer 1

The slash is a directory seperator. So it's a reserved character. On Linux it may work to save a file that way when you escape it but it's not good practice.
On Windows it's completely forbidden.
Change your seperator to something like an underscore. That should work.

$date = date('d/m/Y');
$dateString = str_replace('/', '_', $date);  

Otherwise you could do:

$date = date('d-m-Y');