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 registered under the same name, the compiler function
     has precedence.
    
mixed smarty_compiler_name (string $tag_arg, object &$smarty)
     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.
    
     See also
     register_compiler_function(),
     unregister_compiler_function().
    
Example 16-6. simple compiler function 
<?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'). "';"; } ?>
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      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'; ?>
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