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+Compiler Functions {#plugins.compiler.functions}
+==================
+
+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](#language.custom.functions) registered under the same name,
+the compiler function has precedence.
+
+mixed
+
+smarty\_compiler\_
+
+name
+
+array
+
+\$params
+
+object
+
+\$smarty
+
+The compiler function is passed two parameters: the params array which
+contains precompiled strings for the attribute values and the Smarty
+object. It\'s supposed to return the code to be injected into the
+compiled template including the surrounding PHP tags.
+
+
+    <?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($params, Smarty $smarty)
+    {
+        return "<?php\necho '" . $smarty->_current_file . " compiled at " . date('Y-m-d H:M'). "';\n?>";
+    }
+    ?>
+
+This function can be called from the template as:
+
+
+    {* this function gets executed at compile time only *}
+    {tplheader}
+
+         
+
+The resulting PHP code in the compiled template would be something like
+this:
+
+
+    <?php
+    echo 'index.tpl compiled at 2002-02-20 20:02';
+    ?>
+
+         
+
+See also [`registerPlugin()`](#api.register.plugin),
+[`unregisterPlugin()`](#api.unregister.plugin).