无法在localhost上使用PHP创建动态文件名

Question

Trying to create a dynamic filename with PHP on a localhost.

<?php

    // Create a file with the submitted story
    $created_at = date("Y-m-d-H:i:s");
    $filename = "c:\\Users\\Kirk\\Dropbox\\school\\CS 491\\files\\$created_at.txt";

    echo $filename;

    $handle = fopen($filename, 'w+');
    fclose($handle);

?>

I am able to create a new file, but I get $create_at.txt instead of something like: 2015-04-20-21:00:00.txt.

I've tried numerous escape changes. For instance, if I put $filename inside of quotes like this: fopen("$filename", "w+"); I get a file in my main directory called $filename.

Answer 1

\$ is an escaped dollar sign, which is treated as a regular string, not the start of a variable.

Seems the easiest would be to just concatenate the regular way

$filename = "c:\\Users\\Kirk\\Dropbox\\school\\CS 491\\files\\" . $created_at . ".txt";