<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="dateinterval.createfromdatestring" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>DateInterval::createFromDateString</refname>
  <refpurpose>Sets up a DateInterval from the relative parts of the string</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <para>&style.oop;</para>
  <methodsynopsis role="DateInterval">
   <modifier>public</modifier> <modifier>static</modifier> <type class="union"><type>DateInterval</type><type>false</type></type><methodname>DateInterval::createFromDateString</methodname>
   <methodparam><type>string</type><parameter>datetime</parameter></methodparam>
  </methodsynopsis>
  <para>&style.procedural;</para>
  <methodsynopsis>
   <type class="union"><type>DateInterval</type><type>false</type></type><methodname>date_interval_create_from_date_string</methodname>
   <methodparam><type>string</type><parameter>datetime</parameter></methodparam>
  </methodsynopsis>
  <para>
   Uses the date/time parsers as used in the
   <classname>DateTimeImmutable</classname> constructor to create a
   <classname>DateInterval</classname> from the relative parts of the parsed
   string.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>datetime</parameter></term>
     <listitem>
      <para>
       A date with relative parts. Specifically, the <link
       linkend="datetime.formats.relative">relative formats</link> supported
       by the parser used for <classname>DateTimeImmutable</classname>,
       <classname>DateTime</classname>, and <function>strtotime</function>
       will be used to construct the DateInterval.
      </para>
      <para>
       To use an ISO-8601 format string like <literal>P7D</literal>, you must
       use the constructor.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns a new <classname>DateInterval</classname> instance on success, &return.falseforfailure;.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.2.0</entry>
      <entry>
       Only the <literal>from_string</literal> and
       <literal>date_string</literal> properties will be visible when a
       <classname>DateInterval</classname> is created with this method.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Parsing valid date intervals</title>
    <programlisting role="php">
<![CDATA[
<?php
// Each set of intervals is equal.
$i = new DateInterval('P1D');
$i = DateInterval::createFromDateString('1 day');

$i = new DateInterval('P2W');
$i = DateInterval::createFromDateString('2 weeks');

$i = new DateInterval('P3M');
$i = DateInterval::createFromDateString('3 months');

$i = new DateInterval('P4Y');
$i = DateInterval::createFromDateString('4 years');

$i = new DateInterval('P1Y1D');
$i = DateInterval::createFromDateString('1 year + 1 day');

$i = new DateInterval('P1DT12H');
$i = DateInterval::createFromDateString('1 day + 12 hours');

$i = new DateInterval('PT3600S');
$i = DateInterval::createFromDateString('3600 seconds');
?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title>Parsing combinations and negative intervals</title>
    <programlisting role="php">
<![CDATA[
<?php
$i = DateInterval::createFromDateString('62 weeks + 1 day + 2 weeks + 2 hours + 70 minutes');
echo $i->format('%d %h %i'), "\n";

$i = DateInterval::createFromDateString('1 year - 10 days');
echo $i->format('%y %d'), "\n";
?>
]]>
    </programlisting>
    &example.outputs;
    <screen role="shell">
449 2 70
1 -10
    </screen>
   </example>
  </para>
  <para>
   <example>
    <title>Parsing special relative date intervals</title>
    <programlisting role="php">
<![CDATA[
<?php
$i = DateInterval::createFromDateString('last day of next month');
var_dump($i);

$i = DateInterval::createFromDateString('last weekday');
var_dump($i);
]]>
    </programlisting>
    &example.outputs.82;
    <screen role="php">
<![CDATA[
object(DateInterval)#1 (2) {
  ["from_string"]=>
  bool(true)
  ["date_string"]=>
  string(22) "last day of next month"
}
object(DateInterval)#2 (2) {
  ["from_string"]=>
  bool(true)
  ["date_string"]=>
  string(12) "last weekday"
}
]]>
    </screen>
    &example.outputs.8.similar;
    <screen role="php">
<![CDATA[
object(DateInterval)#1 (16) {
  ["y"]=>
  int(0)
  ["m"]=>
  int(1)
  ["d"]=>
  int(0)
  ["h"]=>
  int(0)
  ["i"]=>
  int(0)
  ["s"]=>
  int(0)
  ["f"]=>
  float(0)
  ["weekday"]=>
  int(0)
  ["weekday_behavior"]=>
  int(0)
  ["first_last_day_of"]=>
  int(2)
  ["invert"]=>
  int(0)
  ["days"]=>
  bool(false)
  ["special_type"]=>
  int(0)
  ["special_amount"]=>
  int(0)
  ["have_weekday_relative"]=>
  int(0)
  ["have_special_relative"]=>
  int(0)
}
object(DateInterval)#2 (16) {
  ["y"]=>
  int(0)
  ["m"]=>
  int(0)
  ["d"]=>
  int(0)
  ["h"]=>
  int(0)
  ["i"]=>
  int(0)
  ["s"]=>
  int(0)
  ["f"]=>
  float(0)
  ["weekday"]=>
  int(0)
  ["weekday_behavior"]=>
  int(0)
  ["first_last_day_of"]=>
  int(0)
  ["invert"]=>
  int(0)
  ["days"]=>
  bool(false)
  ["special_type"]=>
  int(1)
  ["special_amount"]=>
  int(-1)
  ["have_weekday_relative"]=>
  int(0)
  ["have_special_relative"]=>
  int(1)
}
]]>
    </screen>
   </example>
  </para>
 </refsect1>

</refentry>
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