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We drop the duplicate notes section, but instead of moving the information down to the end of the page, we add it to the function description. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@352144 c90b9560-bf6c-de11-be94-00142212c4b1
291 lines
10 KiB
XML
291 lines
10 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.mktime" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>mktime</refname>
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<refpurpose>Get Unix timestamp for a date</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type class="union"><type>int</type><type>false</type></type><methodname>mktime</methodname>
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<methodparam><type>int</type><parameter>hour</parameter></methodparam>
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<methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>minute</parameter><initializer>&null;</initializer></methodparam>
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<methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>second</parameter><initializer>&null;</initializer></methodparam>
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<methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>month</parameter><initializer>&null;</initializer></methodparam>
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<methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>day</parameter><initializer>&null;</initializer></methodparam>
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<methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>year</parameter><initializer>&null;</initializer></methodparam>
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</methodsynopsis>
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<para>
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Returns the Unix timestamp corresponding to the arguments
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given. This timestamp is a long integer containing the number of
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seconds between the Unix Epoch (January 1 1970 00:00:00 GMT) and the time
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specified.
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</para>
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<para>
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Arguments may be left out in order from right to left; any
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arguments thus omitted will be set to the current value according
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to the local date and time.
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</para>
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<simpara>
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Calling <function>mktime</function> without arguments is deprecated.
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<function>time</function> can be used to get the current timestamp.
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</simpara>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>hour</parameter></term>
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<listitem>
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<para>
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The number of the hour relative to the start of the day determined by
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<parameter>month</parameter>, <parameter>day</parameter> and <parameter>year</parameter>.
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Negative values reference the hour before midnight of the day in question.
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Values greater than 23 reference the appropriate hour in the following day(s).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>minute</parameter></term>
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<listitem>
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<para>
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The number of the minute relative to the start of the <parameter>hour</parameter>.
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Negative values reference the minute in the previous hour.
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Values greater than 59 reference the appropriate minute in the following hour(s).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>second</parameter></term>
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<listitem>
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<para>
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The number of seconds relative to the start of the <parameter>minute</parameter>.
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Negative values reference the second in the previous minute.
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Values greater than 59 reference the appropriate second in the following minute(s).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>month</parameter></term>
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<listitem>
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<para>
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The number of the month relative to the end of the previous year.
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Values 1 to 12 reference the normal calendar months of the year in question.
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Values less than 1 (including negative values) reference the months in the previous year in reverse order, so 0 is December, -1 is November, etc.
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Values greater than 12 reference the appropriate month in the following year(s).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>day</parameter></term>
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<listitem>
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<para>
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The number of the day relative to the end of the previous month.
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Values 1 to 28, 29, 30 or 31 (depending upon the month) reference the normal days in the relevant month.
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Values less than 1 (including negative values) reference the days in the previous month, so 0 is the last day of the previous month, -1 is the day before that, etc.
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Values greater than the number of days in the relevant month reference the appropriate day in the following month(s).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>year</parameter></term>
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<listitem>
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<para>
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The number of the year, may be a two or four digit value,
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with values between 0-69 mapping to 2000-2069 and 70-100 to
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1970-2000. On systems where time_t is a 32bit signed integer, as
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most common today, the valid range for <parameter>year</parameter>
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is somewhere between 1901 and 2038. However, before PHP 5.1.0 this
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range was limited from 1970 to 2038 on some systems (e.g. Windows).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>isDST</parameter></term>
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<listitem>
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<para>
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This parameter can be set to 1 if the time is during daylight savings time (DST),
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0 if it is not, or -1 (the default) if it is unknown whether the time is within
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daylight savings time or not. If it's unknown, PHP tries to figure it out itself.
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This can cause unexpected (but not incorrect) results.
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Some times are invalid if DST is enabled on the system PHP is running on or
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<parameter>isDST</parameter> is set to 1. If DST is enabled in e.g. 2:00, all times
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between 2:00 and 3:00 are invalid and <function>mktime</function> returns an undefined
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(usually negative) value.
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Some systems (e.g. Solaris 8) enable DST at midnight so time 0:30 of the day when DST
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is enabled is evaluated as 23:30 of the previous day.
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</para>
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<note>
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<para>
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As of PHP 5.1.0, this parameter became deprecated. As a result, the
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new timezone handling features should be used instead.
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</para>
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</note>
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<note>
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<para>
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This parameter has been removed in PHP 7.0.0.
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</para>
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</note>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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<function>mktime</function> returns the Unix timestamp of the arguments
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given.
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If the arguments are invalid, the function returns &false;.
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</para>
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</refsect1>
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<refsect1 role="errors">
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&reftitle.errors;
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&date.timezone.errors.description;
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<para>
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>8.0.0</entry>
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<entry>
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<parameter>hour</parameter> is no longer optional.
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</entry>
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</row>
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<row>
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<entry>8.0.0</entry>
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<entry>
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<parameter>minute</parameter>, <parameter>second</parameter>, <parameter>month</parameter>,
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<parameter>day</parameter> and <parameter>year</parameter> are nullable now.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title><function>mktime</function> basic example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Set the default timezone to use. Available as of PHP 5.1
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date_default_timezone_set('UTC');
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// Prints: July 1, 2000 is on a Saturday
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echo "July 1, 2000 is on a " . date("l", mktime(0, 0, 0, 7, 1, 2000));
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// Prints something like: 2006-04-05T01:02:03+00:00
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echo date('c', mktime(1, 2, 3, 4, 5, 2006));
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?>
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]]>
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</programlisting>
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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><function>mktime</function> example</title>
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<para>
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<function>mktime</function> is useful for doing date arithmetic
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and validation, as it will automatically calculate the correct
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value for out-of-range input. For example, each of the following
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lines produces the string "Jan-01-1998".
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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echo date("M-d-Y", mktime(0, 0, 0, 12, 32, 1997));
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echo date("M-d-Y", mktime(0, 0, 0, 13, 1, 1997));
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echo date("M-d-Y", mktime(0, 0, 0, 1, 1, 1998));
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echo date("M-d-Y", mktime(0, 0, 0, 1, 1, 98));
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?>
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]]>
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</programlisting>
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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>Last day of a month</title>
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<para>
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The last day of any given month can be expressed as the "0" day
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of the next month, not the -1 day. Both of the following examples
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will produce the string "The last day in Feb 2000 is: 29".
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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$lastday = mktime(0, 0, 0, 3, 0, 2000);
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echo strftime("Last day in Feb 2000 is: %d", $lastday);
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$lastday = mktime(0, 0, 0, 4, -31, 2000);
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echo strftime("Last day in Feb 2000 is: %d", $lastday);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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<refsect1 role="notes">
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&reftitle.notes;
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<caution>
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<para>
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Before PHP 5.1.0, negative timestamps were not supported under any known
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version of Windows and some other systems as well. Therefore the range of
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valid years was limited to 1970 through 2038.
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</para>
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</caution>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>checkdate</function></member>
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<member><function>gmmktime</function></member>
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<member><function>date</function></member>
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<member><function>time</function></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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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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