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# thanks to Mike Ford git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@174391 c90b9560-bf6c-de11-be94-00142212c4b1
109 lines
3.5 KiB
XML
109 lines
3.5 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.11 $ -->
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<!-- splitted from ./en/functions/datetime.xml, last change in rev 1.8 -->
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<refentry id="function.strtotime">
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<refnamediv>
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<refname>strtotime</refname>
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<refpurpose>
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Parse about any English textual datetime description into a Unix
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timestamp
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>int</type><methodname>strtotime</methodname>
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<methodparam><type>string</type><parameter>time</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>now</parameter></methodparam>
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</methodsynopsis>
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<simpara>
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The function expects to be given a string containing an English date
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format and will try to parse that format into a Unix timestamp (the
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number of seconds since January 1 1970 00:00:00 GMT), relative
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to the timestamp given in <parameter>now</parameter>, or the current time
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if none is supplied. Upon failure, <literal>-1</literal> is returned.
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</simpara>
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<simpara>
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Because <function>strtotime</function> behaves according to GNU
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date syntax, have a look at the GNU manual page titled
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<ulink url="&url.gnu.man.date-input;">Date Input Formats</ulink>.
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Described there is valid syntax for the <parameter>time</parameter>
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parameter.
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</simpara>
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<warning>
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<para>
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In PHP 5 up to 5.0.2, <literal>"now"</literal> and other relative times
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are wrongly computed from today's midnight. It differs from other
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versions where it is correctly computed from current time.
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</para>
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</warning>
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<para>
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<example>
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<title><function>strtotime</function> examples</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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echo strtotime("now"), "\n";
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echo strtotime("10 September 2000"), "\n";
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echo strtotime("+1 day"), "\n";
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echo strtotime("+1 week"), "\n";
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echo strtotime("+1 week 2 days 4 hours 2 seconds"), "\n";
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echo strtotime("next Thursday"), "\n";
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echo strtotime("last Monday"), "\n";
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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>Checking for failure</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$str = 'Not Good';
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if (($timestamp = strtotime($str)) === -1) {
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echo "The string ($str) is bogus";
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} else {
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echo "$str == " . date('l dS of F Y h:i:s A', $timestamp);
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}
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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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<note>
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<para>
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The valid range of a timestamp is typically from Fri, 13 Dec
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1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT. (These are
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the dates that correspond to the minimum and maximum values for
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a 32-bit signed integer.)
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Additionally, not all platforms support negative timestamps, therefore
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your date range may be limited to no earlier than the Unix epoch. This
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means that e.g. dates prior to Jan 1, 1970 will not work on Windows,
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some Linux distributions, and a few other operating systems.
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</para>
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</note>
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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:"../../../../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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