Unshift () and shift (), Javascript also has support for parallel methods that work on the beginning of the array, where the index is smallest. Unshift () and shift () are basically the same as push ( ...

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要理解array_push函数的执行过程主要理解栈的思想即可，而array_unshift则是新建一个数组，然后将两数组合并为结果数组。 这次阅读源码过程中，同时也研究了PHP中的哈希表数据结构及一些API，也给自己补充了一些哈希表的知识。