为什么file_put_contents（）给我的文件带来了疯狂的名字？

Question

Trying to create backups using PHP.

$filename = getcwd() . "/backup/" . $slug . date("Y-m-d-h:i:sa") . ".inc";
echo $filename;
file_put_contents($filename, $content);

Expected output filenames:

myfile2014-02-13-4:53:04pm.inc
myfile2014-02-13-4:54:29pm.inc

Actual output filenames:

T6L3PF~C.INC
TAT6YB~L.INC

Also, it is taking a really long time to create the file. This is the really strange thing: I'm also creating another file in the same script--except not in the backup directory.

$filename = getcwd() . "/" . $slug . ".html";
file_put_contents($filename, $content);

It always works perfectly and always is created instantly, no delay.

myfile.html

The backup file isn't created for over a minute, even though it precedes the .html part of the script!

Answer 1

Looks like the problem was here:

date("Y-m-d-h:i:sa")

which should produce:

2014-02-13-4:53:04pm

but apparently the : was messing everything up. Changed it to date("Y-m-d-h.i.sa"), everything working fine now.