PHP Manual
数组函数
Gets the last key of an array

array_key_last

(PHP 7 >= 7.3.0)

array_key_last — Gets the last key of an array

说明

array_key_last ( array $array ) : mixed

Get the last key of the given array without affecting the internal array pointer.

参数

array: An array.

返回值

Returns the last key of array if the array is not empty; NULL otherwise.

参见

array_key_first() - Gets the first key of an array
end() - 将数组的内部指针指向最后一个单元

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