<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>{eval}</title> <meta name="generator" content="DocBook XSL Stylesheets V1.75.1"> <link rel="home" href="index.html" title="Smarty Manual"> <link rel="up" href="language.custom.functions.html" title="Chapter 8. Custom Functions"> <link rel="prev" href="language.function.debug.html" title="{debug}"> <link rel="next" href="language.function.fetch.html" title="{fetch}"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr><th colspan="3" align="center">{eval}</th></tr> <tr> <td width="20%" align="left"> <a accesskey="p" href="language.function.debug.html">Prev</a> </td> <th width="60%" align="center">Chapter 8. Custom Functions</th> <td width="20%" align="right"> <a accesskey="n" href="language.function.fetch.html">Next</a> </td> </tr> </table> <hr> </div> <div class="sect1" title="{eval}"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="language.function.eval"></a>{eval}</h2></div></div></div> <p> <code class="varname">{eval}</code> 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 <em class="parameter"><code>assign</code></em> attribute, the output of the <code class="varname">{eval}</code> function will be assigned to this template variable instead of being output to the template. </p> <div class="informaltable"><table border="1"> <colgroup> <col align="center"> <col align="center"> <col align="center"> <col align="center"> <col> </colgroup> <thead><tr> <th align="center">Attribute Name</th> <th align="center">Type</th> <th align="center">Required</th> <th align="center">Default</th> <th>Description</th> </tr></thead> <tbody> <tr> <td align="center">var</td> <td align="center">mixed</td> <td align="center">Yes</td> <td align="center"><span class="emphasis"><em>n/a</em></span></td> <td>Variable (or string) to evaluate</td> </tr> <tr> <td align="center">assign</td> <td align="center">string</td> <td align="center">No</td> <td align="center"><span class="emphasis"><em>n/a</em></span></td> <td>The template variable the output will be assigned to</td> </tr> </tbody> </table></div> <div class="note" title="Technical Note" style="margin-left: 0.5in; margin-right: 0.5in;"> <h3 class="title">Technical Note</h3> <p> </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"><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 class="listitem"><p> Evaluated variables are compiled on every invocation, the compiled versions are not saved! However if you have <a class="link" href="caching.html" title="Chapter 14. Caching">caching</a> enabled, the output will be cached with the rest of the template. </p></li> </ul></div> <p> </p> </div> <div class="example"> <a name="id3066562"></a><p class="title"><b>Example 8.6. {eval}</b></p> <div class="example-contents"> <p>The contents of the config file, <code class="filename">setup.conf</code>.</p> <pre class="programlisting"> emphstart = <strong> emphend = </strong> title = Welcome to {$company}'s home page! ErrorCity = You must supply a {#emphstart#}city{#emphend#}. ErrorState = You must supply a {#emphstart#}state{#emphend#}. </pre> <p> Where the template is: </p> <pre class="programlisting"> {config_load file='setup.conf'} {eval var=$foo} {eval var=#title#} {eval var=#ErrorCity#} {eval var=#ErrorState# assign='state_error'} {$state_error} </pre> <p> The above template will output: </p> <pre class="screen"> This is the contents of foo. Welcome to Foobar Pub & Grill's home page! You must supply a <strong>city</strong>. You must supply a <strong>state</strong>. </pre> </div> </div> <br class="example-break"><div class="example"> <a name="id3066616"></a><p class="title"><b>Example 8.7. Another {eval} example</b></p> <div class="example-contents"> <p>This outputs the server name (in uppercase) and IP. The assigned variable <em class="parameter"><code>$str</code></em> could be from a database query.</p> <pre class="programlisting"> <?php $str = 'The server name is {$smarty.server.SERVER_NAME|upper} ' .'at {$smarty.server.SERVER_ADDR}'; $smarty->assign('foo',$str); ?> </pre> <p> Where the template is: </p> <pre class="programlisting"> {eval var=$foo} </pre> </div> </div> <br class="example-break"> </div> <div class="navfooter"> <hr> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"> <a accesskey="p" href="language.function.debug.html">Prev</a> </td> <td width="20%" align="center"><a accesskey="u" href="language.custom.functions.html">Up</a></td> <td width="40%" align="right"> <a accesskey="n" href="language.function.fetch.html">Next</a> </td> </tr> <tr> <td width="40%" align="left" valign="top">{debug} </td> <td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td> <td width="40%" align="right" valign="top"> {fetch}</td> </tr> </table> </div> </body> </html>