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><H1
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><A
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></A
>{eval}</H1
><P
> <TT
CLASS="varname"
>{eval}</TT
> is used to evaluate a variable as a template.
This can be used for things like embedding template tags/variables into
variables or tags/variables into config file variables.
</P
><P
> If you supply the <TT
CLASS="parameter"
><I
>assign</I
></TT
> attribute, the output of the
<TT
CLASS="varname"
>{eval}</TT
> function will be assigned to this template
variable instead of being output to the template.
</P
><DIV
CLASS="informaltable"
><A
NAME="AEN2952"
></A
><P
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><THEAD
><TR
><TH
WIDTH="20%"
ALIGN="CENTER"
VALIGN="MIDDLE"
>Attribute Name</TH
><TH
WIDTH="20%"
ALIGN="CENTER"
VALIGN="MIDDLE"
>Type</TH
><TH
WIDTH="20%"
ALIGN="CENTER"
VALIGN="MIDDLE"
>Required</TH
><TH
WIDTH="20%"
ALIGN="CENTER"
VALIGN="MIDDLE"
>Default</TH
><TH
WIDTH="20%"
ALIGN="LEFT"
VALIGN="MIDDLE"
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
WIDTH="20%"
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>var</TD
><TD
WIDTH="20%"
ALIGN="CENTER"
VALIGN="MIDDLE"
>mixed</TD
><TD
WIDTH="20%"
ALIGN="CENTER"
VALIGN="MIDDLE"
>Yes</TD
><TD
WIDTH="20%"
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VALIGN="MIDDLE"
><SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>n/a</I
></SPAN
></TD
><TD
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ALIGN="LEFT"
VALIGN="MIDDLE"
>Variable (or string) to evaluate</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="CENTER"
VALIGN="MIDDLE"
>assign</TD
><TD
WIDTH="20%"
ALIGN="CENTER"
VALIGN="MIDDLE"
>string</TD
><TD
WIDTH="20%"
ALIGN="CENTER"
VALIGN="MIDDLE"
>No</TD
><TD
WIDTH="20%"
ALIGN="CENTER"
VALIGN="MIDDLE"
><SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>n/a</I
></SPAN
></TD
><TD
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ALIGN="LEFT"
VALIGN="MIDDLE"
>The template variable the output will be assigned
to</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Technical Note: </B
>
<P
></P
><UL
><LI
><P
> Evaluated variables are treated the same as templates. They follow
the same escapement and security features just as if they were
templates.
</P
></LI
><LI
><P
> Evaluated variables are compiled on every invocation, the compiled
versions are not saved! However if you have
<A
HREF="caching.html"
>caching</A
> enabled, the
output will be cached with the rest of the template.
</P
></LI
></UL
>
</P
></BLOCKQUOTE
></DIV
><TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN2990"
></A
><P
><B
>Example 8-6. {eval}</B
></P
><P
>The contents of the config file, <TT
CLASS="filename"
>setup.conf</TT
>.</P
><TABLE
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><TR
><TD
><PRE
CLASS="programlisting"
>emphstart = <strong>
emphend = </strong>
title = Welcome to {$company}'s home page!
ErrorCity = You must supply a {#emphstart#}city{#emphend#}.
ErrorState = You must supply a {#emphstart#}state{#emphend#}.</PRE
></TD
></TR
></TABLE
><P
> Where the template is:
</P
><TABLE
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><TR
><TD
><PRE
CLASS="programlisting"
>{config_load file='setup.conf'}
{eval var=$foo}
{eval var=#title#}
{eval var=#ErrorCity#}
{eval var=#ErrorState# assign='state_error'}
{$state_error}</PRE
></TD
></TR
></TABLE
><P
> The above template will output:
</P
><TABLE
BORDER="0"
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><TR
><TD
><PRE
CLASS="screen"
>This is the contents of foo.
Welcome to Foobar Pub & Grill's home page!
You must supply a <strong>city</strong>.
You must supply a <strong>state</strong>.</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN2999"
></A
><P
><B
>Example 8-7. Another {eval} example</B
></P
><P
>This outputs the server name (in uppercase) and IP. The assigned
variable <TT
CLASS="parameter"
><I
>$str</I
></TT
> could be from a database query.</P
><TABLE
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><TR
><TD
><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$str </span><span style="color: #007700">= </span><span style="color: #DD0000">'The server name is {$smarty.server.SERVER_NAME|upper} '<br /> </span><span style="color: #007700">.</span><span style="color: #DD0000">'at {$smarty.server.SERVER_ADDR}'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$smarty</span><span style="color: #007700">-></span><span style="color: #0000BB">assign</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">,</span><span style="color: #0000BB">$str</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></TD
></TR
></TABLE
><P
> Where the template is:
</P
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><TR
><TD
><PRE
CLASS="programlisting"
>{eval var=$foo}</PRE
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