/**
* Switch File Extension
*
* @static
* @access public
* @return string|array
* @param string|array $filename
* @param string $to new file extension
* @param string $from change only files with this extension
* @param bool $reverse change only files not having $from extension
*/
function switchExt($filename, $to, $from = null, $reverse = false)
{
if (is_array($filename)) {
foreach ($filename as $key => $file) {
$filename[$key] = File_Util::switchExt($file, $to, $from);
}
return $filename;
}
if ($len = strlen($from)) {
$ext = substr($filename, -$len - 1);
$cfn = FILE_WIN32 ? 'strcasecmp' : 'strcmp';
if (!$reverse == $cfn($ext, '.' . $from)) {
return $filename;
}
return substr($filename, 0, -$len - 1) . '.' . $to;
}
if ($pos = strpos($filename, '.')) {
return substr($filename, 0, $pos) . '.' . $to;
}
return $filename . '.' . $to;
}
