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smarty/docs/en/programmers/plugins/plugins-compiler-functions.xml

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2004-04-13 11:47:32 +00:00
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision$ -->
<sect1 id="plugins.compiler.functions"><title>Compiler Functions</title>
<para>
Compiler functions are called only during compilation of the template.
They are useful for injecting PHP code or time-sensitive static
content into the template. If there is both a compiler function and a
custom function registered under the same name, the compiler function
has precedence.
</para>
<funcsynopsis>
<funcprototype>
<funcdef>mixed <function>smarty_compiler_<replaceable>name</replaceable></function></funcdef>
<paramdef>string <parameter>$tag_arg</parameter></paramdef>
<paramdef>object <parameter>&amp;$smarty</parameter></paramdef>
</funcprototype>
</funcsynopsis>
<para>
The compiler function is passed two parameters: the tag argument
string - basically, everything from the function name until the ending
delimiter, and the Smarty object. It's supposed to return the PHP code
to be injected into the compiled template.
</para>
<para>
See also
<link linkend="api.register.compiler.function">register_compiler_function()</link>,
<link linkend="api.unregister.compiler.function">unregister_compiler_function()</link>.
</para>
<example>
<title>simple compiler function</title>
<programlisting role="php">
<![CDATA[
<?php
/*
* Smarty plugin
* -------------------------------------------------------------
* File: compiler.tplheader.php
* Type: compiler
* Name: tplheader
* Purpose: Output header containing the source file name and
* the time it was compiled.
* -------------------------------------------------------------
*/
function smarty_compiler_tplheader($tag_arg, &$smarty)
{
return "\necho '" . $smarty->_current_file . " compiled at " . date('Y-m-d H:M'). "';";
}
?>
]]>
</programlisting>
<para>
This function can be called from the template as:
</para>
<programlisting>
{* this function gets executed at compile time only *}
{tplheader}
</programlisting>
<para>
The resulting PHP code in the compiled template would be something like this:
</para>
<programlisting role="php">
<![CDATA[
<?php
echo 'index.tpl compiled at 2002-02-20 20:02';
?>
]]>
</programlisting>
</example>
</sect1>
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