This tells Smarty how to handle PHP code embedded in the
templates. There are four possible settings, the default being
Smarty::PHP_PASSTHRU. Note that this does NOT affect
php code within
{php}{/php} tags in the template.
Smarty::PHP_PASSTHRU - Smarty echos tags as-is.
Smarty::PHP_QUOTE - Smarty quotes the tags as
html entities.
Smarty::PHP_REMOVE - Smarty removes the tags from
the templates.
Smarty::PHP_ALLOW - Smarty will execute the tags
as PHP code.
Embedding PHP code into templates is highly discouraged. Use custom functions or modifiers instead.