所以我有一个使用老版本smarty的旧网站，因为今天我想升级到最新版本，而且它碰到了我一个错误：

[Fri Aug 19 11:21:19 2011] [error] [client ***.***.***.***] PHP Notice: Undefined property: Smarty::$allow_php_tag in /work/smarty3.1rc1/Smarty.class.php on line 592

[Fri Aug 19 11:21:19 2011] [error] [client ***.***.***.***] PHP Fatal error: Uncaught exception 'SmartyCompilerException' with message 'Syntax Error in template "/work/templates/modules/main_module.tpl" on line 2 "{php}" unknown tag "php"' in /work/smarty3.1rc1/sysplugins/smarty_internal_templatecompilerbase.php:596

Stack trace:

#0 /work/smarty3.1rc1/sysplugins/smarty_internal_templatecompilerbase.php(382): Smarty_Internal_TemplateCompilerBase->trigger_template_error('unknown tag "ph...', 2)

#1 /work/smarty3.1rc1/sysplugins/smarty_internal_templateparser.php(2383): Smarty_Internal_TemplateCompilerBase->compileTag('php', Array)

#2 /work/smarty3.1rc1/sysplugins/smarty_internal_templateparser.php(2865): Smarty_Internal_Templateparser->yy_r38()

#3 /work/smarty3.1rc1/sysplugins/smarty_internal_templateparser.php(2965): Smarty_Internal_Templateparser->yy_reduce(38)

#4 in /work/smarty3.1rc1/sysplugins/smarty_internal_templatecompilerbase.php on line 596即使我把Smarty 3.0.8放到了同一个错误中......

由于该网站如果填写了{php}标签，因此无法删除。

我能做什么？

好的，下面@ Pekka的指示我发现了Smarty Security

下一个问题：

$my_security_policy = new Smarty_Security($smarty);

$my_security_policy->allow_php_tag = true;

$my_security_policy->php_functions = array();

$my_security_policy->php_handling = Smarty::PHP_PASSTHRU;

$my_security_policy->php_modifier = array();

$my_security_policy->modifiers = array();

$smarty->enableSecurity($my_security_policy);呼喊：

[Fri Aug 19 12:06:40 2011] [error] [client ***.***.***.***] PHP Fatal error: Uncaught exception 'SmartyCompilerException' with message 'Syntax Error in template .....' modifier 'strtolower' not allowed by security setting'现在有什么错... $my_security_policy->php_functions = array();允许所有的php函数..