smarty/docs/ru/designers/language-custom-functions/language-function-math.xml

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<sect1 id="language.function.math">
 <title>{math}</title>
  <para>
   {math} ïîçâîëÿåò äèçàéíåðàì øàáëîíîâ ïðîâîäèòü ìàòåìàòè÷åñêèå âû÷èñëåíèÿ
   â øàáëîíå. Ëþáûå ÷èñëîâûå ïåðåìåííûå øàáëîíà ìîãóò áûòü èñïîëüçîâàíû â
   óðàâíåíèÿõ, è ðåçóëüòàò áóäåò âûâåäåí íà ìåñòå ýòîãî òåãà.
   Ïåðåìåííûå, èñïîëüçóåìûå â óðàâíåíèè, ïåðåäàþòñÿ â âèäå ïàðàìåòðîâ,
   êîòîðûå ìîãóò áûòü ïåðåìåííûìè øàáëîíà èëè ñòàòè÷åñêèìè çíà÷åíèÿìè.
   +, -, /, *, abs, ceil, cos, exp, floor, log, log10, max, min, pi, pow,
   rand, round, sin, sqrt, srans è tan ÿâëÿþòñÿ äîñòóïíûìè îïåðàòîðàìè.
   Îáðàòèòåñü ê äîêóìåíòàöèè PHP äëÿ ïîëó÷åíèÿ äîïîëíèòåëüíîé èíôîðìàöèè
   ïî ýòèì ìàòåìàòè÷åñêèì ôóíêöèÿì.
  </para>
  <para>
   Åñëè âû óêàçûâàåòå ñïåöèàëüíûé ïàðàìåòð "assign", ðåçóëüòàò âûïîëíåíèÿ
   ôóíêöèè {math} áóäåò ïðèñâîåí ïåðåìåííîé øàáëîíà âìåñòî âûâîäà â øàáëîí.
 </para>
 
 <informaltable frame="all">
  <tgroup cols="5">
   <colspec colname="param" align="center" />
   <colspec colname="type" align="center" />
   <colspec colname="required" align="center" />
   <colspec colname="default" align="center" />
   <colspec colname="desc" />
   <thead>
    <row>
     <entry>Èìÿ àòðèáóòà</entry>
     <entry>Òèï</entry>
     <entry>Îáÿçàòåëåí</entry>
     <entry>Ïî óìîë÷àíèþ</entry>
     <entry>Îïèñàíèå</entry>
    </row>
   </thead>
   <tbody>
    <row>
     <entry>equation</entry>
     <entry>string</entry>
     <entry>Äà</entry>
     <entry><emphasis>n/a</emphasis></entry>
     <entry>óðàâíåíèå äëÿ âûïîëíåíèÿ</entry>
    </row>
    <row>
     <entry>format</entry>
     <entry>string</entry>
     <entry>Íåò</entry>
     <entry><emphasis>n/a</emphasis></entry>
     <entry>ôîðìàò ðåçóëüòàòà (sprintf)</entry>
    </row>
    <row>
     <entry>var</entry>
     <entry>numeric</entry>
     <entry>Äà</entry>
     <entry><emphasis>n/a</emphasis></entry>
     <entry>çíà÷åíèå ïåðåìåííîé óðàâíåíèÿ</entry>
    </row>
    <row>
     <entry>assign</entry>
     <entry>string</entry>
     <entry>Íåò</entry>
     <entry><emphasis>n/a</emphasis></entry>
     <entry>èìÿ ïåðåìåííîé øàáëîíà äëÿ ñîõðàíåíèÿ ðåçóëüòàòà</entry>
    </row>
    <row>
     <entry>[var ...]</entry>
     <entry>numeric</entry>
     <entry>Äà</entry>
     <entry><emphasis>n/a</emphasis></entry>
     <entry>çíà÷åíèå ïåðåìåííîé óðàâíåíèÿ</entry>
    </row>
   </tbody>
  </tgroup>
 </informaltable>

 <note>
  <title>Òåõíè÷åñêîå Çàìå÷àíèå</title>
  <para>
   {math} - ýòî î÷åíü ðåñóðñî¸ìêàÿ ôóíêöèÿ èç-çà èñïîëüçîâàíèÿ åþ ôóíêöèè PHP
   <ulink url="&url.php-manual;eval">eval()</ulink>.
   Âûïîëíåíèå ìàòåìàòè÷åñêèõ îïåðàöèé â PHP íàìíîãî ýôôåêòèâíåå, òàê ÷òî
   ïî âîçìîæíîñòè èñïîëüçóéòå PHP äëÿ ìàòåìàòè÷åñêèõ ðàññ÷åòîâ è
   <link linkend="api.assign">ïðèñâàèâàéòå</link> ðåçóëüòàò øàáëîíó.
   Ïðè ëþáûõ îáñòîÿòåëüñòâàõ, èçáåãàéòå ïîâòîðÿþùèõñÿ âûçîâîâ ôóíêöèè {math},
   íàïðèìåð âíóòðè öèêëîâ
   <link linkend="language.function.section">{section}</link>.
  </para>
 </note>
 <example>
  <title>{math}</title>
  <para>
  <emphasis role="bold">Ïðèìåð ¹1:</emphasis>
  </para>
  <programlisting>
<![CDATA[
   {* $height=4, $width=5 *}

   {math equation="x + y" x=$height y=$width}
]]>
  </programlisting>
  <para>
   Ðåçóëüòàò âûïîëíåíèÿ äàííîãî ïðèìåðà:
  </para>
  <screen>
<![CDATA[
   9
]]>
  </screen>
  <para>
    <emphasis role="bold">Ïðèìåð ¹2:</emphasis>
  </para>
  <programlisting>
<![CDATA[
   {* $row_height = 10, $row_width = 20, #col_div# = 2, assigned in template *}

   {math equation="height * width / division"
   height=$row_height
   width=$row_width
   division=#col_div#}
]]>
  </programlisting>
  <para>
   Ðåçóëüòàò âûïîëíåíèÿ äàííîãî ïðèìåðà:
  </para>
  <screen>
<![CDATA[
   100
]]>
  </screen>
  <para>
  <emphasis role="bold">Ïðèìåð ¹3:</emphasis>
  </para>
  <programlisting>
<![CDATA[
   {* âû ìîæåòå èñïîëüçîâàòü ñêîáêè *}

   {math equation="(( x + y ) / z )" x=2 y=10 z=2}
]]>
  </programlisting>
  <para>
   Ðåçóëüòàò âûïîëíåíèÿ äàííîãî ïðèìåðà:
  </para>
  <screen>
<![CDATA[
   6
]]>
  </screen>
    <para>
    <emphasis role="bold">Ïðèìåð ¹4:</emphasis>
  </para>
  <programlisting>
<![CDATA[
   {* âû ìîæåòå óêàçàòü ôîðìàò sprintf â ïàðàìåòðå format *}

   {math equation="x + y" x=4.4444 y=5.0000 format="%.2f"}
   ]]>
  </programlisting>
  <para>
   Ðåçóëüòàò âûïîëíåíèÿ äàííîãî ïðèìåðà:
  </para>
  <screen>
<![CDATA[
   9.44
]]>
  </screen>
 </example>
</sect1>
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