Watch the variables being used in a function. If you notice a function using an out-of-scope variable more than once, store it in a local variable and use that instead.
仔细检查函数中所有使用的变量，如果有一个变量不是当前作用域定义的，而且使用了不止一次，那么我们就应该把这个变量保存在局部变量中，而使用这个局部变量来进行读写操作。
The calculator makes use of the local statement to declare x as a local variable that is available only within the scope of the mycalc function.
这个计算器利用local语句将x声明为局部变量，只能在mycalc函数的范围内使用。
Because tally is a local variable within the function, it is created anew with each call and falls out of scope and is destroyed automatically when each call returns.
由于tally是函数内的本地变量，它将在每次调用时重新创建并清空范围，并且在每个调用被返回时自动销毁。
The line xdebug.show_local_vars = 1 prints all local variables in the outermost scope of each function call, including variables not yet initialized.
代码行 xdebug.show_local_vars =1将打印每个函数调用的最外围中的所有局部变量，包括尚未初始化的变量。
Usually the local scope references the local names of the (textually) current function.
通常情况下，局部作用域引用当前函数的局部名字。
To explain how scope interacts with overloading we will violate this practice and use a local function declaration.
但为了解释作用域与重载的相互作用，我们将违反上述规则而使用局部函数声明。
A name declared local to a function hides the same name declared in the global scope (Section 2.3.6, p. 54).
在函数中局部声明的名字将屏蔽在全局作用域(第2.3.6节)内声明的同名名字。
Use this function to clear variables of type VARIANTARG (or VARIANT) before the memory that contains the VARIANTARG is freed (as when a local variable goes out of scope).
使用这个函数去清除VARIANTARG(或VARIANT)类型的变量在内存包含的VARIANTARG被释放(当一个局部变量超出作用域时)。
Use this function to clear variables of type VARIANTARG (or VARIANT) before the memory that contains the VARIANTARG is freed (as when a local variable goes out of scope).
使用这个函数去清除VARIANTARG(或VARIANT)类型的变量在内存包含的VARIANTARG被释放(当一个局部变量超出作用域时)。
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