added hrtime example

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@333432 c90b9560-bf6c-de11-be94-00142212c4b1

reference/hrtime/book.xml

@@ -15,7 +15,7 @@ a custom stopwatch using low level ticks delivered by the underlaying APIs.
  </preface>
 
  &reference.hrtime.setup;
- <!--&reference.hrtime.examples;-->
+ &reference.hrtime.examples;
  &reference.hrtime.hrtime.performancecounter;
  &reference.hrtime.hrtime.stopwatch;
  &reference.hrtime.hrtime.unit;

reference/hrtime/examples.xml

@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- $Revision: 321987 $ -->
+<chapter xml:id="hrtime.examples" xmlns="http://docbook.org/ns/docbook">
+ &reftitle.examples;
+ <section xml:id="hrtime.example.basic">
+  <title>Basic usage</title>
+  <para>
+   The example illustrates the basic StopWatch class usage
+  </para>
+  <example>
+   <title>Measure several code blocks execution and get the total</title>
+   <programlisting role="php">
+<![CDATA[
+<?php
+
+$c = new HRTime\StopWatch;
+
+$c->start();
+/* measure this code block execution */
+for ($i = 0; $i < 1024*1024; $i++);
+$c->stop();
+$elapsed0 = $c->getLastElapsedTime(HRTime\Unit::NANOSECOND);
+
+/* measurement is not running here*/
+for ($i = 0; $i < 1024*1024; $i++);
+
+$c->start();
+/* measure this code block execution */
+for ($i = 0; $i < 1024*1024; $i++);
+$c->stop();
+$elapsed1 = $c->getLastElapsedTime(HRTime\Unit::NANOSECOND);
+
+$elapsed_total = $c->getElapsedTime(HRTime\Unit::NANOSECOND);
+
+?>
+]]>
+   </programlisting>
+  </example>
+ </section>
+</chapter>
+
+<!-- Keep this comment at the end of the file
+Local variables:
+mode: sgml
+sgml-omittag:t
+sgml-shorttag:t
+sgml-minimize-attributes:nil
+sgml-always-quote-attributes:t
+sgml-indent-step:1
+sgml-indent-data:t
+indent-tabs-mode:nil
+sgml-parent-document:nil
+sgml-default-dtd-file:"~/.phpdoc/manual.ced"
+sgml-exposed-tags:nil
+sgml-local-catalogs:nil
+sgml-local-ecat-files:nil
+End:
+vim600: syn=xml fen fdm=syntax fdl=2 si
+vim: et tw=78 syn=sgml
+vi: ts=1 sw=1
+-->
+