Even though it's the second item, its key is '0' because it's the first item without an associative key.
Even though it's the second item, its key is '0' because it's the first item without an associative key.
虽然它是第二项，但是由于第一项没有关联，所以它的键值为“0”。
Even though it's the second item, its key is '0' because it's the first item without an associative key.
虽然它是第二项，但是由于第一项没有关联，所以它的键值为“0”。