Please tell me about PHP encryption reverse operation and how to modify it.

Question

Currently: The current encryption result is that 0-9 items are randomly encrypted and the rest are all encrypted

The desired result is: 0-9 items are randomly encrypted and the rest are not encrypted

$fileNameArr = scandir($dir2);

foreach ($fileNameArr as $fileName) {

if ($fileName != '.' && $fileName != ' ..') {

                                $m3u8txt = file_get_contents($dir2.'/'.$fileName);

                        $m3u8txt = str_replace("\r","",$m3u8txt); # preg_match_all('/#EXTINF:(.*),\n?(.*)\n?/',$m3u8txt,$m3u8Arr);

$timeArr = $m3u8Arr[1];

                                                                                    using using using  -                                                                                                         ’ ’ s ’ s ’ s ’ s                   ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐                                                

                                                                                                                                                                                                                                                                                            ​Key = & gt; $ ts) {

$ TS = TRIM ($ ts);

IF ($ jmtype == 1 || ($ jmtype == 2 && strstr ((string)) $key,$r) == true)) {

                                                                                                                                                                             $jmts = publicEncrypt($ts); " . '#EXTINF:' . $timeArr[$key] . ','; ts = '. $ jmts;

## $ m3u8 = $ m3u8. "\ n". $ jmurl;

##} Else {

## $ m3u8 = $ m3u8. "\" \ n" . $ts;

                                                                                               

                                  echo $fileName . '-' . $ts . 'Encryption failed'; }