diff --git a/library/attach_mod/includes/functions_attach.php b/library/attach_mod/includes/functions_attach.php
index c5bf4ab87..0933c5e24 100644
--- a/library/attach_mod/includes/functions_attach.php
+++ b/library/attach_mod/includes/functions_attach.php
@@ -114,7 +114,7 @@ function auth_unpack($auth_cache)
     $auth = [];
     $auth_len = 1;
 
-    for ($pos = 0; $pos < strlen($auth_cache); $pos += $auth_len) {
+    for ($pos = 0, $posMax = strlen($auth_cache); $pos < $posMax; $pos += $auth_len) {
         $forum_auth = $auth_cache[$pos];
         if ($forum_auth == $one_char_encoding) {
             $auth_len = 1;
@@ -149,7 +149,7 @@ function is_forum_authed($auth_cache, $check_forum_id)
     $auth = [];
     $auth_len = 1;
 
-    for ($pos = 0; $pos < strlen($auth_cache); $pos += $auth_len) {
+    for ($pos = 0, $posMax = strlen($auth_cache); $pos < $posMax; $pos += $auth_len) {
         $forum_auth = $auth_cache[$pos];
         if ($forum_auth == $one_char_encoding) {
             $auth_len = 1;
diff --git a/privmsg.php b/privmsg.php
index 5e87c9213..8df644ad9 100644
--- a/privmsg.php
+++ b/privmsg.php
@@ -1288,7 +1288,7 @@ if ($mode == 'read') {
     $previous_days_text = array($lang['ALL_POSTS'], $lang['1_DAY'], $lang['7_DAYS'], $lang['2_WEEKS'], $lang['1_MONTH'], $lang['3_MONTHS'], $lang['6_MONTHS'], $lang['1_YEAR']);
 
     $select_msg_days = '';
-    for ($i = 0; $i < count($previous_days); $i++) {
+    for ($i = 0, $iMax = count($previous_days); $i < $iMax; $i++) {
         $selected = ($msg_days == $previous_days[$i]) ? ' selected="selected"' : '';
         $select_msg_days .= '<option value="' . $previous_days[$i] . '"' . $selected . '>' . $previous_days_text[$i] . '</option>';
     }