php-doc-en/reference/datetime/dateperiod/construct.xml

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<refentry xml:id="dateperiod.construct" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>DatePeriod::__construct</refname>
  <refpurpose>Creates a new DatePeriod object</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <constructorsynopsis role="oop">
   <modifier>public</modifier> <methodname>DatePeriod::__construct</methodname>
   <methodparam><type>DateTimeInterface</type><parameter>start</parameter></methodparam>
   <methodparam><type>DateInterval</type><parameter>interval</parameter></methodparam>
   <methodparam><type>int</type><parameter>recurrences</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>options</parameter><initializer>0</initializer></methodparam>
  </constructorsynopsis>
  <constructorsynopsis role="oop">
   <modifier>public</modifier> <methodname>DatePeriod::__construct</methodname>
   <methodparam><type>DateTimeInterface</type><parameter>start</parameter></methodparam>
   <methodparam><type>DateInterval</type><parameter>interval</parameter></methodparam>
   <methodparam><type>DateTimeInterface</type><parameter>end</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>options</parameter><initializer>0</initializer></methodparam>
  </constructorsynopsis>
  <constructorsynopsis role="oop">
   <modifier>public</modifier> <methodname>DatePeriod::__construct</methodname>
   <methodparam><type>string</type><parameter>isostr</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>options</parameter><initializer>0</initializer></methodparam>
  </constructorsynopsis>
  <para>
   Creates a new DatePeriod object.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>start</parameter></term>
     <listitem>
      <para>
       The start date of the period.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>interval</parameter></term>
     <listitem>
      <para>
       The interval between recurrences within the period.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>recurrences</parameter></term>
     <listitem>
      <para>
       The number of recurrences. Must be greater than <literal>0</literal>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>end</parameter></term>
     <listitem>
      <para>
       The end date of the period.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>isostr</parameter></term>
     <listitem>
      <para>
       An <link
        xlink:href="&url.iso-8601.repeating_intervals;">ISO 8601 repeating interval specification</link>.
       Zero occurrences (<literal>R0/</literal>) are not supported.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>options</parameter></term>
     <listitem>
      <para>
       Can be set to <constant>DatePeriod::EXCLUDE_START_DATE</constant> to
       exclude the start date from the set of recurring dates within the
       period.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>7.2.19, 7.3.6, 7.4.0</entry>
       <entry>
        <parameter>recurrences</parameter> must be greater than <literal>0</literal> now.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>DatePeriod example</title>
    <programlisting role="php">
<![CDATA[
<?php
$start = new DateTime('2012-07-01');
$interval = new DateInterval('P7D');
$end = new DateTime('2012-07-31');
$recurrences = 4;
$iso = 'R4/2012-07-01T00:00:00Z/P7D';

// All of these periods are equivalent.
$period = new DatePeriod($start, $interval, $recurrences);
$period = new DatePeriod($start, $interval, $end);
$period = new DatePeriod($iso);

// By iterating over the DatePeriod object, all of the
// recurring dates within that period are printed.
foreach ($period as $date) {
    echo $date->format('Y-m-d')."\n";
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
2012-07-01
2012-07-08
2012-07-15
2012-07-22
2012-07-29
]]>
    </screen>
   </example>
  </para>
  <para>
   <example>
    <title>DatePeriod example with <constant>DatePeriod::EXCLUDE_START_DATE</constant></title>
    <programlisting role="php">
<![CDATA[
<?php
$start = new DateTime('2012-07-01');
$interval = new DateInterval('P7D');
$end = new DateTime('2012-07-31');

$period = new DatePeriod($start, $interval, $end,
                         DatePeriod::EXCLUDE_START_DATE);

// By iterating over the DatePeriod object, all of the
// recurring dates within that period are printed.
// Note that, in this case, 2012-07-01 is not printed.
foreach ($period as $date) {
    echo $date->format('Y-m-d')."\n";
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
2012-07-08
2012-07-15
2012-07-22
2012-07-29
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <simpara>
   Unbound numbers of repetitions as specified by ISO 8601 section 4.5
   "Recurring time interval" are not supported, i.e. neither passing
   <literal>"R/..."</literal> as <parameter>isostr</parameter> nor passing
   &null; as <parameter>end</parameter> would work.
  </simpara>
 </refsect1>

</refentry>

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