$ENV哈希array包含了环境变量，它允许程序员重定义Accept HTTP头信息。
The $ENV hash array contains the environmental variables, allowing us to interrogate the Accept HTTP header.
$_SERVER序列变量包含了服务器端变量，允许程序员重定义Accept HTTP头信息。
The $_SERVER array contains the server variables, allowing us to interrogate the Accept HTTP header.
它为每个对C8051架构最为有效的变量指针定义了一组地址空间，无需从程序员那里获得特殊指示。
It defines a set of address Spaces for each pointer variable that is optimally efficient for the C8051 architecture, without any specific direction from the programmer.
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