php-doc-ru/reference/array/functions/count.xml

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  <refentry id="function.count">
   <refnamediv>
    <refname>count</refname>
    <refpurpose>Ïîñ÷èòàòü êîëè÷åñòâî ýëåìåíòîâ ìàññèâà èëè êîëè÷åñòâî ñâîéñòâ îáúåêòà</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Îïèñàíèå</title>
     <methodsynopsis>
      <type>int</type><methodname>count</methodname>
      <methodparam><type>mixed</type><parameter>var</parameter></methodparam>
      <methodparam choice="opt"><type>int</type><parameter>mode</parameter></methodparam>
     </methodsynopsis>
    <para>
     Âîçâðàòèòü êîëè÷åñòâî ýëåìåíòîâ ïåðåìåííîé <parameter>var</parameter>,
     êîòîðàÿ îáû÷íî ÿâëÿåòñÿ <type>array</type>, èëè ëþáûì äðóãèì îáúåêòîì, êîòîðûé ìîæåò 
     ñîäåðæàòü õîòÿ áû îäèí ýëåìåíò.
    </para>
    <para>
     Äëÿ îáúåêòîâ <function>count</function> âîçâðàùàåò êîëè÷åñòâî íåñòàòè÷åñêèõ
     ñâîéñòâ, íå ïðèíèìàÿ âî âíèìàíèå âèäèìîñòü. Åñëè ó âàñ âêëþ÷åíà ïîääåðæêà
     <link linkend="ref.spl">SPL</link>, âû ìîæåòå ïåðåõâàòèòü
     <function>count</function>, ðåàëèçóÿ èíòåðôåéñ
     <literal>Countable</literal>. Ýòîò èíòåðôåéñ èìååò òîëüêî îäèí ìåòîä,
     <function>count</function>, êîòîðûé âîçâðàùàåò çíà÷åíèå ôóíêöèè
     <function>count</function>.
    </para>
    <para>
     Åñëè <parameter>var</parameter> íå ÿâëÿåòñÿ îáúåêòîì èëè ìàññèâîì,
     áóäåò âîçâðàùåíà <literal>1</literal>.
     Çà îäíèì èñêëþ÷åíèåì: åñëè <parameter>var</parameter> - &null;,
     òî áóäåò âîçâðàù¸í <literal>0</literal>.
    </para>
    <note>
     <simpara>
      Äîïîëíèòåëüíûé ïàðàìåòð <parameter>mode</parameter> áûë äîáàâëåí íà÷èíàÿ ñ
      PHP 4.2.0.
     </simpara>
    </note>
    <para>
     Åñëè äîïîëíèòåëüíûé ïàðàìåòð <parameter>mode</parameter> óñòàíîâëåí â
     <constant>COUNT_RECURSIVE</constant> (èëè 1), <function>count</function> 
     áóäåò ñ÷èòàòü êîëè÷åñòâî ýëåìåíòîâ ìàññèâà ðåêóðñèâíî.  Ýòî îñîáåííî ïîëåçíî äëÿ ïîäñ÷¸òà 
     âñåõ ýëåìåíòîâ ìíîãîìåðíûõ ìàññèâîâ. Ïðåäóñòàíîâëåííîå çíà÷åíèå
     ïàðàìåòðà <parameter>mode</parameter> - <literal>0</literal>.
     <function>count</function> íå îáíàðóæèâàåò áåñêîíå÷íóþ ðåêóðñèþ.
    </para>
    <caution>
     <para>
      <function>count</function> ìîæåò âîçâðàòèòü 0 äëÿ ïåðåìåííûõ, êîòîðûå
      íå óñòàíîâëåíû, íî òàêæå ìîæåò âîçâðàòèòü 0 äëÿ ïåðåìåííûõ, êîòîðûå
      èíèöèàëèçèðîâàíû ïóñòûì ìàññèâîì. Èñïîëüçóéòå ôóíêöèþ
      <function>isset</function> äëÿ òîãî, ÷òîáû ïðîòåñòèðîâàòü, óñòàíîâëåíà ëè ïåðåìåííàÿ.
     </para>
    </caution>
    <para>
     Ïîæàëóéñòà, ñì. ðàçäåë ýòîãî ðóêîâîäñòâà <link linkend="language.types.array">Array</link>
     äëÿ òîãî, ÷òîáû ïîëó÷èòü äåòàëüíîå ïðåäñòàâëåíèå î ðåàëèçàöèè è èñïîëüçîâàíèè
     ìàññèâîâ â PHP.
    </para>
    <para>
     <example>
      <title>Ïðèìåð èñïîëüçîâàíèÿ <function>count</function></title>
      <programlisting role="php">
<![CDATA[
<?php
$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
$result = count($a);
// $result == 3

$b[0]  = 7;
$b[5]  = 9;
$b[10] = 11;
$result = count($b);
// $result == 3;

$result = count(null);
// $result == 0;

$result = count(false);
// $result == 1;

$obj = new StdClass;
$obj->foo = 'A property';
$obj->bar = 'Another property';
$result = count($obj);
// $result == 2;
?>
]]>
      </programlisting>
     </example>
    </para>
    <para>
     <example>
      <title>
       Ïðèìåð ðåêóðñèâíîãî èñïîëüçîâàíèÿ <function>count</function> (PHP &gt;= 4.2.0)
      </title>
      <programlisting role="php">
<![CDATA[
<?php
$food = array('fruits' => array('orange', 'banana', 'apple'),
              'veggie' => array('carrot', 'collard', 'pea'));

// ðåêóðñèâíûé count
echo count($food, COUNT_RECURSIVE);  // output 8

// îáû÷íûé count
echo count($food);                  // output 2

?>
]]>
      </programlisting>
     </example>
    </para>
    <para>
     Ñì. òàêæå <function>is_array</function>,
     <function>isset</function> è
     <function>strlen</function>.
    </para>
   </refsect1>
  </refentry>

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