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257 lines
6.9 KiB
XML
257 lines
6.9 KiB
XML
<?xml version="1.0" encoding="windows-1251"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 1.8 Maintainer: freespace Status: ready -->
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<sect1 id="language.function.foreach">
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<title>{foreach},{foreachelse}</title>
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<para>
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Öèêëû <emphasis>{foreach}</emphasis> ÿâëÿþòñÿ àëüòåðíàòèâîé
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öèêëàì <link
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linkend="language.function.section"><emphasis>{section}</emphasis></link>.
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<emphasis>{foreach}</emphasis> èñïîëüçóåòñÿ äëÿ ïðîõîäà ïî
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<emphasis role="bold">åäèíñòâåííîìó àññîöèàòèâíîìó ìàññèâó</emphasis>.
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Ñèíòàêñèñ
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<emphasis>{foreach}</emphasis> íàìíîãî ïðîùå ñèíòàêñèñà
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<emphasis>{section}</emphasis>, íî ñ äðóãîé ñòîðîíû
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<emphasis role="bold">åãî ìîæíî èñïîëüçîâàòü òîëüêî äëÿ îäíîãî ìàññèâà</emphasis>.
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Êàæäûé òýã <emphasis>{foreach}</emphasis> äîëæåí èìåòü ïàðó
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<emphasis>{/foreach}</emphasis>. Îáÿçàòåëüíûìè ïàðàìåòðàìè ÿâëÿþòñÿ
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<emphasis>from</emphasis> è <emphasis>item</emphasis>.
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Èìÿ öèêëà {foreach} ìîæåò áûòü ëþáûì, ñîñòîÿùèì èç áóêâ, öèôð è çíàêîâ
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ïîä÷åðêèâàíèÿ. Öèêëû <emphasis>{foreach}</emphasis> ìîãóò áûòü âëîæåííûìè
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è èìåíà âëîæåííûõ {foreach} äîëæíû áûòü óíèêàêëüíûìè ìåæäó ñîáîé.
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Ïàðàìåòð <emphasis>from</emphasis> (îáû÷íî - ìàññèâ çíà÷åíèé)
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îïðåäåëÿåò êîëè÷åñòâî èòåðàöèé öèêëà <emphasis>{foreach}</emphasis>.
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<emphasis>{foreachelse}</emphasis> âûïîëíÿåòñÿ â òîì ñëó÷àå, åñëè
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ïàðàìåòð <emphasis>from</emphasis> íå ñîäåðæèò çíà÷åíèé.
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</para>
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<informaltable frame="all">
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<tgroup cols="5">
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<colspec colname="param" align="center" />
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<colspec colname="type" align="center" />
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<colspec colname="required" align="center" />
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<colspec colname="default" align="center" />
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<colspec colname="desc" />
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<thead>
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<row>
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<entry>Èìÿ àòðèáóòà</entry>
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<entry>Òèï</entry>
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<entry>Îáÿçàòåëåí</entry>
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<entry>Ïî óìîë÷àíèþ</entry>
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<entry>Îïèñàíèå</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>from</entry>
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<entry>array</entry>
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<entry>Äà</entry>
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<entry><emphasis>n/a</emphasis></entry>
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<entry>Ìàññèâ, ïî êîòîðîìó íàäî ïðîéòèñü</entry>
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</row>
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<row>
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<entry>item</entry>
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<entry>string</entry>
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<entry>Äà</entry>
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<entry><emphasis>n/a</emphasis></entry>
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<entry>Èìÿ ïåðåìåííîé, êîòîðàÿ áóäåò âûñòóïàòü â
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êà÷åñòâå çíà÷åíèÿ òåêóùåãî åëåìåíòà</entry>
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</row>
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<row>
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<entry>key</entry>
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<entry>string</entry>
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<entry>Íåò</entry>
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<entry><emphasis>n/a</emphasis></entry>
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<entry>Èìÿ ïåðåìåííîé, êîòîðàÿ áóäåò âûñòóïàòü â
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êà÷åñòâå êëþ÷à òåêóùåãî åëåìåíòà</entry>
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</row>
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<row>
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<entry>name</entry>
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<entry>string</entry>
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<entry>Íåò</entry>
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<entry><emphasis>n/a</emphasis></entry>
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<entry>Íàçâàíèå öèêëà foreach äëÿ äîñòóïà ê åãî
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ñâîéñòâàì</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<example>
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<title>{foreach} - ïðåäìåò</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$arr = array( 1001,1002,1003);
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$smarty->assign('custid', $arr);
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?>
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]]>
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</programlisting>
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<programlisting>
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<![CDATA[
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{* ýòîò ïðèìåð íàïå÷àòàåò âñå ïåðåìåííûå ìàññèâà $custid *}
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{foreach from=$custid item=curr_id}
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id: {$curr_id}<br />
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{/foreach}
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]]>
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</programlisting>
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<para>
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Ðåçóëüòàò âûïîëíåíèÿ äàííîãî ïðèìåðà:
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</para>
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<screen>
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<![CDATA[
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id: 1000<br />
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id: 1001<br />
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id: 1002<br />
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]]>
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</screen>
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</example>
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<example>
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<title>{foreach} - ïðåäìåò è êëþ÷</title>
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<programlisting role="php">
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<![CDATA[
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// Êëþ÷ ñîäåðæèò êëþ÷ äëÿ êàæäîãî çíà÷åíèÿ èç öèêëà
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// íàçíà÷åíèå âûãëÿäèò ïðèìåðíî òàê:
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<?php
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$smarty->assign('contacts', array(
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array('phone' => '1',
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'fax' => '2',
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'cell' => '3'),
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array('phone' => '555-4444',
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'fax' => '555-3333',
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'cell' => '760-1234')
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));
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?>
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]]>
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</programlisting>
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<programlisting>
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<![CDATA[
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{foreach name=outer item=contact from=$contacts}
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<hr />
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{foreach key=key item=item from=$contact}
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{$key}: {$item}<br>
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{$key}: {$item}<br />
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{/foreach}
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{/foreach}
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]]>
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</programlisting>
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<para>
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Ðåçóëüòàò âûïîëíåíèÿ äàííîãî ïðèìåðà:
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</para>
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<screen>
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<![CDATA[
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<hr />
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phone: 1<br />
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fax: 2<br />
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cell: 3<br />
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<hr />
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phone: 555-4444<br />
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fax: 555-3333<br />
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cell: 760-1234<br />
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]]>
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</screen>
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</example>
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<example>
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<title>{foreach} - áàçû äàííûõ (ê ïðèìåðó, PEAR èëè ADODB)</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$sql = 'select contact_id, name, nick from contacts order by contact';
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$smarty->assign("contacts", $db->getAssoc($sql));
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?>
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]]>
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</programlisting>
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<programlisting>
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<![CDATA[
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{foreach key=cid item=con from=$contacts}
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<a href="contact.php?contact_id={$cid}">{$con.name} - {$con.nick}</a><br />
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{/foreach}
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]]>
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</programlisting>
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</example>
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<para>
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Öèêëû {foreach} òàêæå èìåþò ñîáñòâåííûå ïåðåìåííûå, êîòîðûå ñîäåðæàò ñâîéñòâà
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{foreach}.
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Îíè îáîçíà÷àþòñÿ òàê:
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<link linkend="language.variables.smarty.loops">{$smarty.foreach.foreachname.varname}</link>
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{$smarty.foreach.foreachname.varname}, ãäå foreachname - ýòî íàçâàíèå öèêëà
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(çíà÷åíèå àòðèáóòà <emphasis>name</emphasis>).
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</para>
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<para>
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Ñì. <link linkend="section.property.index">{section}</link>
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äëÿ ïðèìåðîâ ñëåäóþùèõ ñâîéñòâ, òàê êàê îíè èäåíòè÷íû.
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</para>
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<sect2 id="foreach.property.iteration">
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<title>iteration</title>
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<para>
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iteration èñïîëüçóåòñÿ äëÿ îòîáðàæåíèÿ òåêóùåãî íîìåðà èòåðàöèè öèêëà.
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Èòåðàöèè âñåãäà íà÷èíàþòñÿ ñ 1 è óâåëè÷èâàþòñÿ íà îäíó ïðè êàæäîì
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ïðîõîæäåíèè öèêëà.
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</para>
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</sect2>
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<sect2 id="foreach.property.first">
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<title>first</title>
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<para>
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<emphasis>first</emphasis> óñòàíàâëèâàåòñÿ â true, åñëè òåêóùàÿ èòåðàöèÿ ïåðâàÿ.
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</para>
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</sect2>
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<sect2 id="foreach.property.last">
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<title>last</title>
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<para>
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<emphasis>last</emphasis> óñòàíàâëèâàåòñÿ â true, åñëè òåêóùàÿ èòåðàöèÿ ïîñëåäíÿÿ.
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</para>
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</sect2>
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<sect2 id="foreach.property.show">
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<title>show</title>
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<para>
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Àòðèáóò <emphasis>show</emphasis> ìîæåò ïðèíèìàòü ëîãè÷åñêèå
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çíà÷åíèÿ (èñòèíà èëè ëîæü). Åñëè ëîæü, òî öèêë foreach íå áóäåò
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îòîáðàæàòüñÿ. Åñëè ïðèñóòñòâóåò òýã foreachelse, òî îí áóäåò
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îòîáðàæåí.
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</para>
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</sect2>
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<sect2 id="foreach.property.total">
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<title>total</title>
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<para>
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<emphasis>total</emphasis> õðàíèò êîëè÷åñòâî èòåðàöèé öèêëà.
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Ìîæåò áûòü èñïîëüçîâàíî êàê â öèêëå, òàê è âíå åãî.
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</para>
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<para>
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Ñì. òàêæå <link linkend="language.function.section">{section}</link> è
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<link linkend="language.variables.smarty.loops">$smarty.foreach</link>.
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</para>
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</sect2>
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</sect1>
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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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