+ // create random boundary, 20 chars, always beginning with KaiRo ;-)
+ $boundary = 'KaiRo';
+ for ($i=1; $i<=15; $i++) {
+ $r=rand(0,61);
+ if ($r<10) { $boundary .= chr($r+48); }
+ elseif ($r<36) { $boundary .= chr($r+55); }
+ elseif ($r<62) { $boundary .= chr($r+61); }
+ }