To run this code through PHP, you need the graphics library.
为了通过PHP运行此代码，需要一个图形库。
To finish the example code, you'll want to add some graphics.
要完成示例代码，则需要添加一些图形。
The new code for the graphics library is shown in Listing 3.
这个图形库的新代码如清单3所示。
The new code for the graphics library is shown in Listing 3.
这个图形库的新代码如清单3所示。
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