If you run this code, your output will probably look a little different, but the logic sequence of activities will line up.

如果运行此代码，您的输出可能有所不同，但活动的逻辑顺序将保持不变。

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The states map only has one output card, so modify the line of code that looks for the output card to point to output card 1 instead of card 2: card = map.getOutputCardObject(1);

州数据图只有一个输出卡，因此需要修改查找输出卡的代码行，使其指向输出卡 1 而不是输出卡 2：card = map.getOutputCardObject(1);。

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The exec() command is similar to shell_exec(), except it returns the last line of the output and, optionally, populates an array with the full output of the command, along with the error code.

exec() 命令与 shell_exec() 相似，不同之处是它返回输出的最后一行，并且可选地用命令的完整输出和错误代码填充数组。

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