让我们首先查看许多PHP应用程序中的一项常用技术；将某些种类的信息存入程序开头的变量赋值语句中。

Let's start by looking at a common technique in many PHP applications: placing certain kinds of information in variable assignment statements at the top of the program.

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例如你要写一句赋值语句，你可以声明任何类型的变量，在等号的左边使用任何标识符，然后在右边给出任何的表达式。

In writing an assignment statement, for example, you can declare variables of any type, use any identifier to the left of the equal sign, and supply any expression on the right.

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变量赋值，比如set语句。

Variable assignments, such as SET statements.

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