diff --git a/reference/mbstring/functions/mb-convert-case.xml b/reference/mbstring/functions/mb-convert-case.xml
index 930b9de6d4..054aaaec70 100644
--- a/reference/mbstring/functions/mb-convert-case.xml
+++ b/reference/mbstring/functions/mb-convert-case.xml
@@ -91,6 +91,23 @@ echo $str; // Prints MARY HAD A LITTLE LAMB AND SHE LOVED IT SO
 $str = mb_convert_case($str, MB_CASE_TITLE, "UTF-8");
 echo $str; // Prints Mary Had A Little Lamb And She Loved It So
 ?>
+]]>
+    </programlisting>
+   </example>
+  </para>
+
+  <para>
+   <example>
+    <title><function>mb_convert_case</function> example with non-Latin UTF-8 text</title>
+    <programlisting role="php">
+<![CDATA[
+<?php
+$str = "Τάχιστη αλώπηξ βαφής ψημένη γη, δρασκελίζει υπέρ νωθρού κυνός";
+$str = mb_convert_case($str, MB_CASE_UPPER, "UTF-8");
+echo $str; // Prints ΤΆΧΙΣΤΗ ΑΛΏΠΗΞ ΒΑΦΉΣ ΨΗΜΈΝΗ ΓΗ, ΔΡΑΣΚΕΛΊΖΕΙ ΥΠΈΡ ΝΩΘΡΟΎ ΚΥΝΌΣ
+$str = mb_convert_case($str, MB_CASE_TITLE, "UTF-8");
+echo $str; // Prints Τάχιστη Αλώπηξ Βαφήσ Ψημένη Γη, Δρασκελίζει Υπέρ Νωθρού Κυνόσ
+?>
 ]]>
     </programlisting>
    </example>
diff --git a/reference/mbstring/functions/mb-strtolower.xml b/reference/mbstring/functions/mb-strtolower.xml
index f8433bd485..7273032649 100644
--- a/reference/mbstring/functions/mb-strtolower.xml
+++ b/reference/mbstring/functions/mb-strtolower.xml
@@ -74,6 +74,21 @@ $str = "Mary Had A Little Lamb and She LOVED It So";
 $str = mb_strtolower($str);
 echo $str; // Prints mary had a little lamb and she loved it so
 ?>
+]]>
+    </programlisting>
+   </example>
+  </para>
+
+  <para>
+   <example>
+    <title><function>mb_strtolower</function> example with non-Latin UTF-8 text</title>
+    <programlisting role="php">
+<![CDATA[
+<?php
+$str = "Τάχιστη αλώπηξ βαφής ψημένη γη, δρασκελίζει υπέρ νωθρού κυνός";
+$str = mb_strtolower($str, 'UTF-8');
+echo $str; // Prints τάχιστη αλώπηξ βαφής ψημένη γη, δρασκελίζει υπέρ νωθρού κυνός
+?>
 ]]>
     </programlisting>
    </example>
diff --git a/reference/mbstring/functions/mb-strtoupper.xml b/reference/mbstring/functions/mb-strtoupper.xml
index 4aa871a133..25a8096e2d 100644
--- a/reference/mbstring/functions/mb-strtoupper.xml
+++ b/reference/mbstring/functions/mb-strtoupper.xml
@@ -74,6 +74,21 @@ $str = "Mary Had A Little Lamb and She LOVED It So";
 $str = mb_strtoupper($str);
 echo $str; // Prints MARY HAD A LITTLE LAMB AND SHE LOVED IT SO
 ?>
+]]>
+    </programlisting>
+   </example>
+  </para>
+
+  <para>
+   <example>
+    <title><function>mb_strtoupper</function> example with non-Latin UTF-8 text</title>
+    <programlisting role="php">
+<![CDATA[
+<?php
+$str = "Τάχιστη αλώπηξ βαφής ψημένη γη, δρασκελίζει υπέρ νωθρού κυνός";
+$str = mb_strtoupper($str, 'UTF-8');
+echo $str; // Prints ΤΆΧΙΣΤΗ ΑΛΏΠΗΞ ΒΑΦΉΣ ΨΗΜΈΝΗ ΓΗ, ΔΡΑΣΚΕΛΊΖΕΙ ΥΠΈΡ ΝΩΘΡΟΎ ΚΥΝΌΣ
+?>
 ]]>
     </programlisting>
    </example>