Resource plugins are meant as a generic way of providing template
sources or PHP script components to Smarty. Some examples of resources:
databases, LDAP, shared memory, sockets, and so on.
There are a total of four functions that need to be registered for each
type of resource. Every function will receive the requested resource as
the first parameter and the Smarty object as the last parameter. The
rest of parameters depend on the function.
The first function, source() is supposed to retrieve
the resource. Its second parameter $source is a
variable passed by reference where the result should be
stored. The function is supposed to return TRUE if
it was able to successfully retrieve the resource and FALSE otherwise.
The second function, timestamp() is supposed to
retrieve the last modification time of the requested resource, as a UNIX
timestamp. The second parameter $timestamp
is a variable passed by reference where the timestamp should be stored.
The function is supposed to return TRUE if the timestamp could be
succesfully determined, or FALSE otherwise.
The third function, secure()is supposed to return
TRUE or FALSE, depending on whether the requested resource is secure
or not. This function is used only for template resources but
should still be defined.
The fourth function, trusted() is supposed to return
TRUE or FALSE, depending on whether the requested resource
is trusted or not. This function is used for only for PHP script
components requested by {include_php} tag or
{insert}
tag with the src attribute. However, it should still
be defined even for template resources.
Example 16-10. resource plugin
<?php /* * Smarty plugin * ------------------------------------------------------------- * File: resource.db.php * Type: resource * Name: db * Purpose: Fetches templates from a database * ------------------------------------------------------------- */ function smarty_resource_db_source($tpl_name, &$tpl_source, &$smarty) { // do database call here to fetch your template, // populating $tpl_source $sql = new SQL; $sql->query("select tpl_source from my_table where tpl_name='$tpl_name'"); if ($sql->num_rows) { $tpl_source = $sql->record['tpl_source']; return true; } else { return false; } }
function smarty_resource_db_timestamp($tpl_name, &$tpl_timestamp, &$smarty) { // do database call here to populate $tpl_timestamp. $sql = new SQL; $sql->query("select tpl_timestamp from my_table where tpl_name='$tpl_name'"); if ($sql->num_rows) { $tpl_timestamp = $sql->record['tpl_timestamp']; return true; } else { return false; } }
function smarty_resource_db_secure($tpl_name, &$smarty) { // assume all templates are secure return true; }
function smarty_resource_db_trusted($tpl_name, &$smarty) { // not used for templates } ?>
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