smarty/docs/ru/designers/language-builtin-functions/language-function-if.xml

<?xml version="1.0" encoding="windows-1251"?>
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<sect1 id="language.function.if">
 <title>{if},{elseif},{else}</title>
 <para>
  Êîíñòðóêöèÿ <emphasis>{if}</emphasis> â Smarty òàêàÿ æå ãèáêàÿ, êàê è
  êîíñòðóêöèÿ
  <ulink url="&url.php-manual;if"><command>if</command></ulink> â PHP,
  òîëüêî ñ íåñêîëüêèìè äîïîëíèòåëüíûìè âîçìîæíîñòÿìè äëÿ øàáëîíîâ.
  Êàæäûé òýã <emphasis>{if}</emphasis> äîëæåí èìåòü ïàðó
  <emphasis>{/if}</emphasis>. <emphasis>{else}</emphasis> è
  <emphasis>{elseif}</emphasis> òàê æå äîïóñòèìû. Äîñóòïíû âñå êâàëèôèêàòîðû
  è ôóíêöèè
  èç PHP, òàêèå êàê <emphasis>||</emphasis>, <emphasis>or</emphasis>,
  <emphasis>&amp;&amp;</emphasis>, <emphasis>and</emphasis>,
  <emphasis>is_array()</emphasis> è ò.ä.
 </para>
 
 <para>
  Åñëè <link linkend="variable.security">$security</link> âêëþ÷åíà,
  òî ìàññèâ <emphasis>IF_FUNCS</emphasis> â ìàññèâå <link
  linkend="variable.security.settings">$security_settings</link>.
 </para>
 
 <para>
  Íèæå ñëåäóåò ñïèñîê ðàñïîçíàâàåìûõ êâàëèôèêàòîðîâ, êîòîðûå äîëæíû áûòü
  îòäåëåíû îò îêðóæàþùèõ ýëåìåíòîâ ïðîáåëàìè. Îáðàòèòå âíèìàíèÿ, ÷òî
  îáúåêòû â [êâàäðàòíûõ ñêîáêàõ] ÿâëÿþòñÿ íåîáÿçàòåëüíûìè. Èíîãäà óêàçàíû
  ýêâèâàëåíòû â PHP.
 </para>
 
 <informaltable frame="all">
  <tgroup cols="4">
   <colspec colname="qualifier" align="center" />
   <colspec colname="alternates" align="center" />
   <colspec colname="meaning" />
   <colspec colname="example" />
   <colspec colname="php" />
   <thead>
    <row>
     <entry>Êâàëèôèêàòîð</entry>
     <entry>Àëüòåðíàòèâû</entry>
     <entry>Ïðèìåð ñèíòàêñèñà</entry>
     <entry>Îïèñàíèå</entry>
     <entry>Ýêâèâàëåíò PHP</entry>
    </row>
   </thead>
   <tbody>
    <row>
     <entry>==</entry>
     <entry>eq</entry>
     <entry>$a eq $b</entry>
     <entry>ðàâíî</entry>
     <entry>==</entry>
    </row>
    <row>
     <entry>!=</entry>
     <entry>ne, neq</entry>
     <entry>$a neq $b</entry>
     <entry>íå ðàâíî</entry>
     <entry>!=</entry>
    </row>
    <row>
     <entry>&gt;</entry>
     <entry>gt</entry>
     <entry>$a gt $b</entry>
     <entry>áîëüøå</entry>
     <entry>&gt;</entry>
    </row>
    <row>
     <entry>&lt;</entry>
     <entry>lt</entry>
     <entry>$a lt $b</entry>
     <entry>ìåíüøå</entry>
     <entry>&lt;</entry>
    </row>
    <row>
     <entry>&gt;=</entry>
     <entry>gte, ge</entry>
     <entry>$a ge $b</entry>
     <entry>áîëüøå èëè ðàâíî</entry>
     <entry>&gt;=</entry>
    </row>
    <row>
     <entry>&lt;=</entry>
     <entry>lte, le</entry>
     <entry>$a le $b</entry>
     <entry>ìåíüøå èëè ðàâíî</entry>
     <entry>&lt;=</entry>
    </row>
    <row>
     <entry>===</entry>
     <entry></entry>
     <entry>$a === 0</entry>
     <entry>ïðîâåðêà èäåíòè÷íîñòè</entry>
     <entry>===</entry>
    </row>
    <row>
     <entry>!</entry>
     <entry>not</entry>
     <entry>not $a</entry>
     <entry>îòðèöàíèå</entry>
     <entry>!</entry>
    </row>
    <row>
     <entry>%</entry>
     <entry>mod</entry>
     <entry>$a mod $b</entry>
     <entry>îñòàòîê îò äåëåíèÿ</entry>
     <entry>%</entry>
    </row>
    <row>
     <entry>is [not] div by</entry>
     <entry></entry>
     <entry>$a is not div by 4</entry>
     <entry>âîçìîæíî äåëåíèå áåç îñòàòêà</entry>
     <entry>$a % $b == 0</entry>
    </row>
    <row>
     <entry>is [not] even</entry>
     <entry></entry>
     <entry>$a is not even</entry>
     <entry>[íå]÷¸òíî</entry>
     <entry>$a % 2 == 0</entry>
    </row>
    <row>
      <entry>is [not] even by</entry>
      <entry></entry>
      <entry>$a is not even by $b</entry>
      <entry>[íå]÷¸òíî çíà÷åíèþ</entry>
      <entry>($a / $b) % 2 == 0</entry>
    </row>
    <row>
     <entry>is [not] odd</entry>
     <entry></entry>
     <entry>$a is not odd</entry>
     <entry>[íå]íå÷¸òíî</entry>
     <entry>$a % 2 != 0</entry>
    </row>
    <row>
     <entry>is [not] odd by</entry>
     <entry></entry>
     <entry>$a is not odd by $b</entry>
     <entry>[íå]íå÷¸òíî çíà÷åíèþ</entry>
     <entry>($a / $b) % 2 != 0</entry>
    </row>
   </tbody>
  </tgroup>
 </informaltable>
 
 <example>
  <title>ïðèìåðû èñïîëüçîâàíèÿ {if}</title>
  <programlisting>
<![CDATA[
{if $name eq 'Fred'}
	Welcome Sir.
{elseif $name eq 'Wilma'}
    Welcome Ma'am.
{else}
    Welcome, whatever you are.
{/if}

{* ïðèìåð ñ ëîãèêîé "èëè" *}
{if $name eq 'Fred' or $name eq 'Wilma'}
	...
{/if}

{* òî æå ñàìîå, ÷òî è âûøå *}
{if $name == 'Fred' || $name == 'Wilma'}
	...
{/if}

{* ñêîáêè ðàçðåøåíû *}
{if ( $amount < 0 or $amount > 1000 ) and $volume >= #minVolAmt#}
	...
{/if}

{* âû òàêæå ìîæåòå èñïîëüçîâàòü ôóíêöèè php *}
{if count($var) gt 0}
	...
{/if}

{* ïðîâåðêà íà ìàññèâ *}
{if is_array($foo) }
 ...
{/if}
  	 
{* ïðîâåðêà íà ñóùåñòâîâàíèå *}
{if isset($foo) }
 ...
{/if}

{* ïðîâåðÿåò ÷¸òíîñòü çíà÷åíèé *}
{if $var is even}
	...
{/if}
{if $var is odd}
	...
{/if}
{if $var is not odd}
	...
{/if}

{* ïðîâåðÿåò, äåëèòñÿ ëè $var íà 4 áåç îñòàòêà *}
{if $var is div by 4}
	...
{/if}

{*
  ïðîâåðÿåò, ÿâëÿåòñÿ ëè $var ÷¸òíûì äâóì, íàïðèìåð
  0=÷¸òíî, 1=÷¸òíî, 2=íå÷¸òíî, 3=íå÷¸òíî, 4=÷¸òíî, 5=÷¸òíî è ò.ä.
*}
{if $var is even by 2}
	...
{/if}

{* 0=÷¸òíî, 1=÷¸òíî, 2=÷¸òíî, 3=íå÷¸òíî, 4=íå÷¸òíî, 5=íå÷¸òíî è ò.ä. *}
{if $var is even by 3}
	...
{/if}
]]>
  </programlisting>
 </example>
 
 <example>
   <title>åù¸ íåñêîëüêî ïðèìåðîâ èñïîëüçîâàíèÿ {if}</title>
   <programlisting>
<![CDATA[
{if isset($name) && $name = 'Blog'}
    {* ñäåëàòü ÷òî-íèáóäü *}
{elseif $name == $foo}
    {* ñäåëàòü ÷òî-íèáóäü äðóãîå *}
{/if}

{if is_array($foo) && count($foo) > 0)
    {* âûïîëíèòü öèêë foreach *}
{/if}
]]>
  </programlisting>
 </example>

</sect1>
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