We also note that there are assignment statements prior to the two service invocations, which may be arbitrarily complex. This leads to another requirement.
我们还注意到，在两个服务调用之前存在分配语句，该语句可能非常复杂。
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.
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。
Other than for assignment, statements are introduced by keywords.
与赋值不同，语句是用关键字引入的。
Prefer Variable Initializers to Assignment Statements.
变量声明时初始化优于赋值语句。
Prefer Variable Initializers to Assignment Statements.
变量声明时初始化优于赋值语句。
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