Simple PHP script, mainly for sharing random files with people using curl. (and thus in an easily scriptable way)

Puts a file sent via POST into a configured directory with a randomised filename but preserving the original file extension and returns a link to it.
Actually serving the file to people is left to apache to figure out.

There's also a mechanism for removing files over a certain age, which can be invoked by calling the script with a commandline argument.

All configuration is done using the global variables at the top of index.php. Hopefully they're explained well enough in the short comments besides them.

To accommodate for larger uploads, you'll also need to set the following values in your php.ini:
upload_max_filesize
post_max_size
max_input_time
max_execution_time
(The output of index.php will also warn you, if any of those are set too small)

The code responsible for the default info text can be found at the very bottom of index.php, in case you want to reword anything.

Pretty straight forward, I use something like this:

<Directory /path/to/webroot/>
    Options +FollowSymLinks -MultiViews -Indexes
    AddDefaultCharset UTF-8
    AllowOverride None

    RewriteEngine On
    RewriteCond "%{ENV:REDIRECT_STATUS}" "^$"
    RewriteRule "^/?$" "index.php" [L,END]
    RewriteRule "^(.+)$" "files/$1" [L,END]
</Directory>

<Directory /path/to/webroot/files>
    Options -ExecCGI
    php_flag engine off
    SetHandler None
    AddType text/plain .php .php5 .html .htm .cpp .c .h .sh
</Directory>

To check for any files that exceed their max age and delete them, you need to call index.php with the argument "purge"

php index.php purge

To automate this, simply create a cron job:

0 0 * * * cd /path/to/the/root; php index.php purge > /dev/null

If you specify $STORE_PATH using an absolute path, you can omit the cd

The max age of a file is computed using the following formula:

$file_max_age = $MIN_FILEAGE +  
                ($MAX_FILEAGE - $MIN_FILEAGE) *  
                pow(1-($fileSize/$MAX_FILESIZE),$DECAY_EXP);

...which is a basic exponential decay curve that favours smaller files, meaning small files are kept longer and really big ones are deleted relatively quickly.
$DECAY_EXP is one of the configurable globals and basically makes the curve more or less exponential-looking. Set to 1 for a completely linear relationship.