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写了多年程序，突然想知道为什么函数可以连着用啊
source link: https://www.v2ex.com/t/488475
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PHP - @pinews - 就是 a(b(c()))这样，虽然经常这样用，总觉得怪怪的，不知道在哪里是否有专门的说明？
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