mirror of
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git-svn-id: https://svn.php.net/repository/phpdoc/fr/trunk@350223 c90b9560-bf6c-de11-be94-00142212c4b1
165 lines
4.8 KiB
XML
165 lines
4.8 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: a59ed9b526c8bae64a3e762063f2bd4de39a00da Maintainer: jbnahan Status: ready -->
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<!-- Reviewed: no -->
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<!-- CREDITS: DAnnebicque -->
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<chapter xml:id="datetime.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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&reftitle.examples;
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<section xml:id="datetime.examples-arithmetic">
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<title>Arithmétique avec DateTime </title>
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<para>
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Les exemples suivants montrent quelques pièges de l'arithmétique de DateTime
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en ce qui concerne les transitions DST et les mois ayant un nombre différent
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de jours.
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</para>
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<para>
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<example>
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<title>DateTimeImmutable::add/sub ajout d'un interval de temps écoulé.</title>
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<simpara>
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Ajouter PT24H au dela d'une transition DST semblera ajouter 23/25 heures (pour
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la plupart des fuseaux horaires).
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</simpara>
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<programlisting role="php">
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<![CDATA[
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<?php
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$dt = new DateTimeImmutable("2015-11-01 00:00:00", new DateTimeZone("America/New_York"));
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echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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$dt = $dt->add(new DateInterval("PT3H"));
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echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Start: 2015-11-01 00:00:00 -04:00
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End: 2015-11-01 02:00:00 -05:00
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]]>
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</screen>
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</example>
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</para>
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<para>
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<example>
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<title>DateTimeImmutable::modify et strtotime incrémentation ou décrémentation de valeurs individuelles</title>
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<simpara>
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Ajouter +24 heures au dela d'une transition DST peut ajouter exactement 24
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heures comme vu avec la chaîne date/time
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(sauf si l'heure de début ou de fin est sur un point de transition).
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</simpara>
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<programlisting role="php">
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<![CDATA[
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<?php
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$dt = new DateTimeImmutable("2015-11-01 00:00:00", new DateTimeZone("America/New_York"));
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echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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$dt = $dt->modify("+24 hours");
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echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Start: 2015-11-01 00:00:00 -04:00
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End: 2015-11-02 00:00:00 -05:00
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]]>
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</screen>
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</example>
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</para>
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<para>
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<example>
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<title>L'ajout ou la soustraction de dates/heures peut dépasser
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(en plus ou en moins) des dates</title>
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<simpara>
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Comme pour 31 Janvier + 1 mois donnera comme résultat 2 Mars (année bisextile) ou
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3 Mars (année normale).
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</simpara>
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<programlisting role="php">
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<![CDATA[
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<?php
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echo "Normal year:\n"; // February has 28 days
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$dt = new DateTimeImmutable("2015-01-31 00:00:00", new DateTimeZone("America/New_York"));
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echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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$dt = $dt->modify("+1 month");
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echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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echo "Leap year:\n"; // February has 29 days
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$dt = new DateTimeImmutable("2016-01-31 00:00:00", new DateTimeZone("America/New_York"));
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echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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$dt = $dt->modify("+1 month");
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echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Normal year:
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Start: 2015-01-31 00:00:00 -05:00
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End: 2015-03-03 00:00:00 -05:00
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Leap year:
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Start: 2016-01-31 00:00:00 -05:00
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End: 2016-03-02 00:00:00 -05:00
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]]>
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</screen>
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<simpara>
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Pour obtenir le dernier du mois prochain (autrement dit pour prevenir
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le dépassement),
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le format <literal>last day of</literal> est disponible depuis PHP 5.3.0.
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</simpara>
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<programlisting role="php">
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<![CDATA[
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<?php
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echo "Normal year:\n"; // February has 28 days
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$dt = new DateTimeImmutable("2015-01-31 00:00:00", new DateTimeZone("America/New_York"));
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echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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$dt = $dt->modify("last day of next month");
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echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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echo "Leap year:\n"; // February has 29 days
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$dt = new DateTimeImmutable("2016-01-31 00:00:00", new DateTimeZone("America/New_York"));
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echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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$dt = $dt->modify("last day of next month");
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echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Normal year:
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Start: 2015-01-31 00:00:00 -05:00
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End: 2015-02-28 00:00:00 -05:00
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Leap year:
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Start: 2016-01-31 00:00:00 -05:00
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End: 2016-02-29 00:00:00 -05:00
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]]>
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</screen>
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</example>
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</para>
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</section>
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</chapter>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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