array_key_last返回数组的最后一个键
/** * Gets the last key of an array * * Get the last key of the given array without affecting the internal array pointer. * * @link https://secure.php.net/array_key_last * @param array $array An array * @return string|int|null Returns the last key of array if the array is not empty; NULL otherwise. * @since 7.3 */ function array_key_last(array $array) { }
示例:
$array = [ 'a' => 'cat', 'b' => 'dog', 'c' => 'pig' ]; $result = array_key_last($array); var_dump($result); //结果 //string(1) "c"