Inconsistency between ArrayHelper functions

[Aradiv]

What steps will reproduce the problem?

$arr=['a.b' => ['c' => 'value1', 'd.e' => "value2"]];
ArrayHelper.getValue($arr, 'a.b.c'); //this will return value1
ArrayHelper.setValue($arr, 'a.b.c', 'newValue');
ArrayHelper.getValue($arr, 'a.b.c'); //this will still return value1
ArrayHelper.keyExists('a.b.c', $arr,); //false
ArrayHelper.remove($arr, 'a.b.c'); //this wont work but is currently worked on in #168 

/*
$arr = [
  'a' => [
    'b' => [
      'c' => 'newValue',
    ],
  ],
  'a.b' => [
    'c' => 'value1',
   'd.e' => 'value2', // unreachable with dot syntax
  ]
]*/

What is the expected result?

Using the same key for any function in ArrayHelper (getValue, setValue, remove, keyExists) should result in accessing the same key.

What do you get instead?

Different behavior depending on which function you are using.

Additional info

Q	A
Yii version	3.0@dev
PHP version	7.1
Operating system	Debian 9

[Aradiv]

My suggestion for this issue would be:

1. if the litteral string exist us this
2. if not split on all dots.

so getValue, keyExists will try to use $arr['a.b.c'] and if this doenst work $arr['a']['b']['c'] and if this also fails return default/false

setValue/remove will first delete/create
$arr['a.b.c'] than $arr['a']['b']['c']
(setValue will check if $arr['a'] exists and only if so it will create $arr['a']['b']['c'] otherwise $arr['a.b.c'])

Yes for cases like $arr['a']['b.c'] and $arr['a.b']['c'] this means they can only be accessed by providing an array with the correct splitting as key.

also ['a.b','c.d'] will only access $arr['a.b']['c.d'].