/**
* Get a filename that is sanitized and unique for the given directory.
*
* If the filename is not unique, then a number will be added to the filename
* before the extension, and will continue adding numbers until the filename is
* unique.
*
* @since 0.1
*
* @param string $dir
* @param string $filename
* @return string New filename, if given wasn't unique.
*/
function unique_filename($dir, $filename)
{
// sanitize the file name before we begin processing
$filename = File::sanitize_file_name($filename);
// separate the filename into a name and extension
$info = pathinfo($filename);
$ext = !empty($info['extension']) ? '.' . $info['extension'] : '';
$name = basename($filename, $ext);
// edge case: if file is named '.ext', treat as an empty name
if ($name === $ext) {
$name = '';
}
// Increment the file number until we have a unique file to save in $dir.
$number = '';
// change '.ext' to lower case
if ($ext && strtolower($ext) != $ext) {
$ext2 = strtolower($ext);
$filename2 = preg_replace('|' . preg_quote($ext) . '$|', $ext2, $filename);
// check for both lower and upper case extension or image sub-sizes may be overwritten
while (file_exists($dir . "/{$filename}") || file_exists($dir . "/{$filename2}")) {
$new_number = $number + 1;
$filename = str_replace("{$number}{$ext}", "{$new_number}{$ext}", $filename);
$filename2 = str_replace("{$number}{$ext2}", "{$new_number}{$ext2}", $filename2);
$number = $new_number;
}
return $filename2;
}
while (file_exists($dir . "/{$filename}")) {
if ('' == "{$number}{$ext}") {
$filename = $filename . ++$number . $ext;
} else {
$filename = str_replace("{$number}{$ext}", ++$number . $ext, $filename);
}
}
return $filename;
}
