Add examples to datetime serialization methods

Author: Fan2Shrek

reference/datetime/datetimeinterface/serialize.xml

@@ -40,6 +40,27 @@
   </para>
  </refsect1>
 
+ <refsect1 role="examples">
+  &reftitle.examples;
+  <example>
+   <title><function>DateTime::serialize</function> example</title>
+   <programlisting role="php">
+<![CDATA[
+<?php
+$date = new DateTime('2025-03-27');
+var_dump(serialize($date));
+?>
+]]>
+   </programlisting>
+   &examples.outputs;
+   <screen>
+<![CDATA[
+string(114) "O:8:"DateTime":3:{s:4:"date";s:26:"2025-03-27 00:00:00.000000";s:13:"timezone_type";i:3;s:8:"timezone";s:3:"UTC";}"
+]]>
+   </screen>
+  </example>
+ </refsect1>
+
  <refsect1 role="seealso">
   &reftitle.seealso;
   <simplelist>

reference/datetime/datetimeinterface/unserialize.xml

@@ -48,6 +48,34 @@
   </para>
  </refsect1>
 
+ <refsect1 role="examples">
+  &reftitle.examples;
+  <example>
+   <title><function>DateTime::unserialize</function> example</title>
+   <programlisting role="php">
+<![CDATA[
+<?php
+$serializedDate = 'O:8:"DateTime":3:{s:4:"date";s:26:"2025-03-27 00:00:00.000000";s:13:"timezone_type";i:3;s:8:"timezone";s:3:"UTC";}';
+var_dump(unserialize($serializedDate));
+?>
+]]>
+   </programlisting>
+   &examples.outputs;
+   <screen>
+<![CDATA[
+object(DateTime)#1 (3) {
+  ["date"]=>
+  string(26) "2025-03-27 00:00:00.000000"
+  ["timezone_type"]=>
+  int(3)
+  ["timezone"]=>
+  string(3) "UTC"
+}
+]]>
+   </screen>
+  </example>
+ </refsect1>
+
  <refsect1 role="seealso">
   &reftitle.seealso;
   <simplelist>