$security
安全变量

$security true/false, default is false. Security is good for situations when you have untrusted parties editing the templates (via ftp for example) and you want to reduce the risk of system security compromises through the template language. Turning on security enforces the following rules to the template language, unless specifially overridden with $security_settings:
安全变量要么是真,要么是假.默认为假.当你不信任模板中的可编辑部分(例如通过ftp方式上传编辑的),并想通过模板语言减小系统非安全的风险时,安全变量设为真比较适合.设为真会将下面的规则强加于模板语言中,除非特别地用$security_settings覆盖.