Trying to sort an 2-dimensional array of pizza toppings by the category of topping it belongs to. But the way the client supplies the data isn't ideal for this. Here's a sample of the data:Trying to sort an 2-dimensional array of pizza
阅读背景：
使用usort()对具有层次排序标准的二维数组进行排序
来源：互联网
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