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Create a file name that doesn't exist in a folder
function create_filename ($folder, $fn, $rnd = TRUE)
Create a unique file name that doesn't exist in a folder.
$folder = target folder.
$fn = original file name.
$rnd = if true will return a random file name, if false will return a safe version of file name.
Example 1
<?php
require './includes/user_init.php';
$fn = 'index.php';
echo create_filename ('.', $fn, false);
// output: 9d8_index.php
// 9d8 = random string
?>
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