With the allowed parameters defined in an array, the call from the application program to the argument processing code can be kept as simple as a single call to a static method.
有了得到允许的在一个数组中定义的形参，应用程序对参数处理代码的调用就可以像对一个静态方法的单个调用一样简单。
The generated code is relatively simple and modifying its behavior, as well as adding validations and extra processing, is easily understood.
生成的代码相当简单，修改其行为以及添加检验功能和额外的处理也很容易。
The code presented here is a relatively simple image processing algorithm using GD.
本文提供的代码是相对简单的、使用GD的图像处理算法。
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