PHP数组作为数组键 [英] PHP array as array key

问题描述

是否有可能在php中将数组也设为数组键？

Is it possible in php to make an array an array key as well?

示例：

array(
   array('sample', 'abc') => 'sample value'
);

推荐答案

否，如果您阅读了手册

一个数组在PHP中实际上是一个有序映射。映射是一种将值与键相关联的类型。该类型针对多种不同用途进行了优化。它可以被视为数组，列表（向量），哈希表（地图的实现），字典，集合，堆栈，队列等等。因为数组值可以是其他数组，所以树和多维数组也是可能的。

An array in PHP is actually an ordered map. A map is a type that associates values to keys. This type is optimized for several different uses; it can be treated as an array, list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue, and probably more. As array values can be other arrays, trees and multidimensional arrays are also possible.

And：

密钥可以是整数或字符串。该值可以是任何类型。

The key can either be an integer or a string. The value can be of any type.

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