PHP Array Structure Validator: Validate complex array structure using rules

Yii2 validator for complex array structures

Validator for array attributes, unlike builtin "each" validator, that support only one rule, this validator can * validate multiple array attributes and even nested data structures * All keys that should be present in array must be described, for optional keys default value should be set * When input array not contains key defined in rules, this key added automatically with null value * When input array contains key not defined in rules, "unexpected item" error will be defined

Installation

#### Usage

For a simple array with known keys like `['id'=>1, 'name'=>'John Doe']`;

public function rules() { return [ //...

   ['simpleArray', ArrayStructureValidator::class, 
      'rules'=>[
             'id'=>[['required'], ['integer','min'=>0]],
             'name'=>[['required'], ['string', 'max'=>100]],
             'sex'=>[['default', 'value'=>'male'], ['in','range'=>['male','female']]
        ]]
   ],

]; }

For multidimensional arrays like 
`
[
    ['id'=>1, 'name'=>'John Doe'],
    ['id'=>2, 'name'=>'Jane Doe','sex'=>'female'],
     ...
]`
 set each = true

public function rules() { return [ //...

   [['multiArray', 'some', 'attrs'], 'required'],
   ['multiArray', ArrayStructureValidator::class, 
      'each'=>true,
       'rules'=>[
             'id'=>[['required'], ['integer','min'=>0]],
             'name'=>[['required'], ['string', 'max'=>100]],
             'sex'=>[['default', 'value'=>'male'], ['in','range'=>['male','female']]
        ]]
   ]

]; }

For nested structures like 

[

'user'=>['id'=>1, 'name'=>'John Doe'],
'coords'=>[['x'=>1, 'y'=>2],['x'=>3,'y'=>4]]

]

public function rules() { return [ //...

   ['complexArray', ArrayStructureValidator::class, 
    'rules'=>[
             'user'=>[[ArrayStructureValidator::class, 
                   'rules'=>[
                       'id'=>[['required'], ['integer','min'=>0]],
                       'name'=>[['required'], ['string', 'max'=>100]],
             ]]],
             'coords'=>[[ArrayStructureValidator::class, 
                  'each'=>true, 
                  'rules'=>[
                        'x'=>[['required'], ['integer','min'=>0]],
                        'y'=>[['required'], ['integer','min'=>0]],
             ], 'min'=>1, 'max'=>5]],
       ], 'min'=>2, 'max'=>2]

]; }

Model scenarios supported

public function rules() { return [ //...

    ['conditional', ArrayStructureValidator::class, 
    'rules'=>[
              'a'=>[['integer','min'=>0]], //will be checked on any scenario
              'b'=>[
                      ['default', 'value'=>1, 'on'=>['create']],
                      ['integer', 'max'=>10, 'except'=>['create']],
                      ['required',  'on'=>['update']],
                      ['integer', 'max'=>1000, 'on'=>['update']],
                  ]
         ]
    ]
];

}

Closure and Inline validators supported, but with signature different from default

Inline method in model class

public function rules() { return [

  ['array', ArrayStructureValidator::class,  'rules'=>[
         'item'=>[['required'], ['customValidator']]
  ]]

]; }

public function customValidator($attribute, $model, $index, $baseModel, $baseAttribute){ / * $model - Dynamic model with attributes equals value data, or value row, if used with each=>true * $attribute - current keyName * $index - current array index for multidimensional arrays, or null * $baseModel - instance of initial model, where validator was attached * $baseAttribute - name of initial attributed, where validator was attached

* access to validated value - $model->$attribute * access to whole validated array $baseModel->$baseAttribute * $model->addError($attribute, '[{index}][{attribute}] Error message', ['index'=>$index]); */ }

When conditions supported (But not whenClient!)

public function rules() { return [

  ['conditional', ArrayStructureValidator::class, 
      'rules'=>[
           'x'=>[['safe']],
           'y'=>[
               ['default', 'value'=>1, 'when'=>fn(DynamicModel $model) => $model->x < 10],
               [
                  'default',
                  'value'=>5,
                  'when'=>function($model, $attribute, $index, $baseModel, $baseAttribute){
                          return count($baseModel->$baseAttribute) > 5;
                     }],
               ]
       ]]

]; }

#### Note:
Database related validators (exists, unique) not covered by tests yet and not supported