array-udiff.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.array-udiff" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>array_udiff</refname>
  <refpurpose>データの比較にコールバック関数を用い、配列の差を計算する</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>array_udiff</methodname>
   <methodparam><type>array</type><parameter>array</parameter></methodparam>
   <methodparam rep="repeat"><type>array</type><parameter>arrays</parameter></methodparam>
   <methodparam><type>callable</type><parameter>value_compare_func</parameter></methodparam>
  </methodsynopsis>
  <para>
   データの比較にコールバック関数を用い、配列の差を計算します。
   この関数は、データの比較に内部関数を利用する
   <function>array_diff</function> とは異なります。
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>array</parameter></term>
     <listitem>
      <para>
       最初の配列。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>arrays</parameter></term>
     <listitem>
      <para>
       比較対象の配列。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>value_compare_func</parameter></term>
     <listitem>
      &sort.callback.description;
      &sort.callback.description.presort;
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   他の引数のいずれにも存在しない
   <parameter>array</parameter> の値の全てを有する配列を返します。
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>array_udiff</function> で stdClass オブジェクトを使う例</title>
    <programlisting role="php">
<![CDATA[
<?php
// 比較する配列
$array1 = array(new stdClass, new stdClass,
                new stdClass, new stdClass,
               );

$array2 = array(
                new stdClass, new stdClass,
               );

// オブジェクトにプロパティを設定します
$array1[0]->width = 11; $array1[0]->height = 3;
$array1[1]->width = 7;  $array1[1]->height = 1;
$array1[2]->width = 2;  $array1[2]->height = 9;
$array1[3]->width = 5;  $array1[3]->height = 7;

$array2[0]->width = 7;  $array2[0]->height = 5;
$array2[1]->width = 9;  $array2[1]->height = 2;

function compare_by_area($a, $b) {
    $areaA = $a->width * $a->height;
    $areaB = $b->width * $b->height;
    
    if ($areaA < $areaB) {
        return -1;
    } elseif ($areaA > $areaB) {
        return 1;
    } else {
        return 0;
    }
}

print_r(array_udiff($array1, $array2, 'compare_by_area'));
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Array
(
    [0] => stdClass Object
        (
            [width] => 11
            [height] => 3
        )

    [1] => stdClass Object
        (
            [width] => 7
            [height] => 1
        )

)
]]>
    </screen>
   </example>
  </para>
  <para>
   <example>
    <title><function>array_udiff</function> で DateTime オブジェクトを使う例</title>
    <programlisting role="php">
<![CDATA[
<?php
class MyCalendar {
    public $free = array();
    public $booked = array();

    public function __construct($week = 'now') {
        $start = new DateTime($week);
        $start->modify('Monday this week midnight');
        $end = clone $start;
        $end->modify('Friday this week midnight');
        $interval = new DateInterval('P1D');
        foreach (new DatePeriod($start, $interval, $end) as $freeTime) {
            $this->free[] = $freeTime;
        }
    }

    public function bookAppointment(DateTime $date, $note) {
        $this->booked[] = array('date' => $date->modify('midnight'), 'note' => $note);
    }

    public function checkAvailability() {
        return array_udiff($this->free, $this->booked, array($this, 'customCompare'));
    }
    
    public function customCompare($free, $booked) {
        if (is_array($free)) $a = $free['date'];
        else $a = $free;
        if (is_array($booked)) $b = $booked['date'];
        else $b = $booked;
        if ($a == $b) {
            return 0;
        } elseif ($a > $b) {
            return 1;
        } else {
            return -1;
        }
    }
}

// 毎週の予約用のカレンダーを作ります
$myCalendar = new MyCalendar;

// 今週の予約を入れます
$myCalendar->bookAppointment(new DateTime('Monday this week'), "Cleaning GoogleGuy's apartment.");
$myCalendar->bookAppointment(new DateTime('Wednesday this week'), "Going on a snowboarding trip.");
$myCalendar->bookAppointment(new DateTime('Friday this week'), "Fixing buggy code.");

// 空きが何日あるかを調べるため、$booked の日数と $free の日数を比べます
echo "I'm available on the following days this week...\n\n";
foreach ($myCalendar->checkAvailability() as $free) {
    echo $free->format('l'), "\n"; 
}
echo "\n\n";
echo "I'm busy on the following days this week...\n\n";
foreach ($myCalendar->booked as $booked) {
    echo $booked['date']->format('l'), ": ", $booked['note'], "\n"; 
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
I'm available on the following days this week...

Tuesday
Thursday


I'm busy on the following days this week...

Monday: Cleaning GoogleGuy's apartment.
Wednesday: Going on a snowboarding trip.
Friday: Fixing buggy code.
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <simpara>
    この関数は n 次元配列の一つの次元しかチェックしないことに注意してください。
    もちろん、<literal>array_udiff($array1[0], $array2[0], "data_compare_func");</literal>
    のようにすることでより深い次元でのチェックもできます。
   </simpara>
  </note>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>array_diff</function></member>
    <member><function>array_diff_assoc</function></member>
    <member><function>array_diff_uassoc</function></member>
    <member><function>array_udiff_assoc</function></member>
    <member><function>array_udiff_uassoc</function></member>
    <member><function>array_intersect</function></member>
    <member><function>array_intersect_assoc</function></member>
    <member><function>array_uintersect</function></member>
    <member><function>array_uintersect_assoc</function></member>
    <member><function>array_uintersect_uassoc</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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