This speedup is due to the fact that the array is a fixed size, not a variable-sized one like the default PHP one is, and that non-numeric indexes are not allowed.
造成这种速度优势的原因是数组是固定大小的，而默认的 PHP 数组是可变大小的，并且不允许非数值型索引。
A variable of array type has three important limitations: Its size is fixed, the size must be known at compile time, and the array exists only until the end of the block in which it was defined.
数组类型的变量有三个重要的限制：数组长度固定不变，在编译时必须知道其长度，数组只在定义它的块语句内存在。
A parameter self-learning algorithm is presented after defining data structure and variable array to improve the prototype's adaptability to different size of workpieces.
在定义了数据结构和变量数组的基础上，给出了参数自学习过程算法，改善了模型样机对不同规格样本工件的适应性。
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