diff --git a/src/includes/traits/Shared/CachePathUtils.php b/src/includes/traits/Shared/CachePathUtils.php
index 7973ba0b..f040004a 100644
--- a/src/includes/traits/Shared/CachePathUtils.php
+++ b/src/includes/traits/Shared/CachePathUtils.php
@@ -133,7 +133,7 @@ public function buildCachePath($url, $with_user_token = '', $with_version_salt =
                     $url_parts['path'] = '/lp-'.sha1($url_parts['path']).'/';
                 }
             } // Now add the path and check for a possible root `index/` suffix.
-            if (!empty($url_parts['path']) && strlen($url_parts['path'] = trim($url_parts['path'], '\\/'." \t\n\r\0\x0B"))) {
+            if (!empty($url_parts['path']) && mb_strlen($url_parts['path'] = trim($url_parts['path'], '\\/'." \t\n\r\0\x0B"))) {
                 $cache_path .= $url_parts['path'].'/'; // Add the path as it exists.
 
                 if (!($flags & $this::CACHE_PATH_NO_PATH_INDEX) && $is_multisite && $is_a_multisite_base_dir_root) {
diff --git a/src/includes/traits/Shared/HookUtils.php b/src/includes/traits/Shared/HookUtils.php
index a406fc99..779c8f97 100644
--- a/src/includes/traits/Shared/HookUtils.php
+++ b/src/includes/traits/Shared/HookUtils.php
@@ -61,7 +61,7 @@ public function addHook($hook, $function, $priority = 10, $accepted_args = 1)
     {
         $hook = (string) $hook;
         if (mb_stripos($hook, 'zencache') === 0) {
-            $hook = GLOBAL_NS.mb_substr($hook, strlen('zencache'));
+            $hook = GLOBAL_NS.mb_substr($hook, mb_strlen('zencache'));
         }
         $priority      = (integer) $priority;
         $accepted_args = max(0, (integer) $accepted_args);
@@ -129,7 +129,7 @@ public function removeHook($hook, $function, $priority = 10)
     {
         $hook = (string) $hook;
         if (mb_stripos($hook, 'zencache') === 0) {
-            $hook = GLOBAL_NS.mb_substr($hook, strlen('zencache'));
+            $hook = GLOBAL_NS.mb_substr($hook, mb_strlen('zencache'));
         }
         $priority = (integer) $priority;
         $hook_id  = $this->hookId($function);
@@ -245,7 +245,7 @@ public function doWpAction($hook)
         call_user_func_array('do_action', $args);
 
         if (mb_stripos($hook, GLOBAL_NS) === 0) {
-            $zencache_filter  = 'zencache'.mb_substr($hook, strlen(GLOBAL_NS));
+            $zencache_filter  = 'zencache'.mb_substr($hook, mb_strlen(GLOBAL_NS));
             $zencache_args    = $args; // Use a copy of the args.
             $zencache_args[0] = $zencache_filter;
             call_user_func_array('do_action', $zencache_args);
@@ -268,7 +268,7 @@ public function applyWpFilters($hook)
         $value = call_user_func_array('apply_filters', $args);
 
         if (mb_stripos($hook, GLOBAL_NS) === 0) {
-            $zencache_hook    = 'zencache'.mb_substr($hook, strlen(GLOBAL_NS));
+            $zencache_hook    = 'zencache'.mb_substr($hook, mb_strlen(GLOBAL_NS));
             $zencache_args    = $args; // Use a copy of the args.
             $zencache_args[0] = $zencache_hook;
             $zencache_args[1] = $value; // Filtered value.
diff --git a/src/includes/traits/Shared/ReplaceUtils.php b/src/includes/traits/Shared/ReplaceUtils.php
index c6a7b689..0f320a4d 100644
--- a/src/includes/traits/Shared/ReplaceUtils.php
+++ b/src/includes/traits/Shared/ReplaceUtils.php
@@ -28,7 +28,7 @@ public function strReplaceOnce($needle, $replace, $haystack, $caSe_insensitive =
         if (($needle_strpos = $caSe_mb_strpos($haystack, $needle)) === false) {
             return $haystack; // Nothing to replace.
         }
-        return (string) substr_replace($haystack, $replace, $needle_strpos, strlen($needle));
+        return (string) substr_replace($haystack, $replace, $needle_strpos, mb_strlen($needle));
     }
 
     /**
diff --git a/src/includes/traits/Shared/StringUtils.php b/src/includes/traits/Shared/StringUtils.php
index fdd6df17..d676ca13 100644
--- a/src/includes/traits/Shared/StringUtils.php
+++ b/src/includes/traits/Shared/StringUtils.php
@@ -35,9 +35,9 @@ public function clip($value, $max_length = 80, $force_ellipsis = false)
         $string = preg_replace('/\s+/u', ' ', strip_tags($string));
         $string = trim($string); // Trim it up now.
 
-        if (strlen($string) > $max_length) {
+        if (mb_strlen($string) > $max_length) {
             $string = (string) mb_substr($string, 0, $max_length - 3).'...';
-        } elseif ($force_ellipsis && strlen($string) + 3 > $max_length) {
+        } elseif ($force_ellipsis && mb_strlen($string) + 3 > $max_length) {
             $string = (string) mb_substr($string, 0, $max_length - 3).'...';
         } else {
             $string .= $force_ellipsis ? '...' : '';
@@ -74,7 +74,7 @@ public function midClip($value, $max_length = 80)
         $string = preg_replace('/\s+/u', ' ', strip_tags($string));
         $string = trim($string); // Trim it up now.
 
-        if (strlen($string) <= $max_length) {
+        if (mb_strlen($string) <= $max_length) {
             return $string; // Nothing to do.
         }
         $full_string     = $string;
@@ -85,7 +85,7 @@ public function midClip($value, $max_length = 80)
             ? mb_substr($full_string, 0, $first_clip).'...'
             : '...'; // Ellipsis only.
 
-        $second_clip = strlen($full_string) - ($max_length - strlen($string));
+        $second_clip = mb_strlen($full_string) - ($max_length - mb_strlen($string));
         $string .= $second_clip >= 0 && $second_clip >= $first_clip
             ? mb_substr($full_string, $second_clip) : '';