The shell includes some built-in variables that you can use, too. Here are some of them.

Shell也包括了一些内建的变量可供食用，这是其中的几个。

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With easy access to form variables, built-in HTML templates, and integrated database access, PHP has proven to be a rapid programming language for Web developers.

方便的表单变量访问、内置的HTML模板和集成的数据库访问，使PHP成为Web开发人员的快速编程语言。

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The Vue language supports most of the C operations, C-89 data types, has its own built-in variables(_pid, _tid) and functions(stacktrace, timestamp).

Vue 语言支持大多数 C 操作符和 C-89 数据类型，还有它自己的内置变量 (_pid, _tid) 和函数 (stacktrace, timestamp)。

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