{    "orders": [        {            "customer_id": 123,            "items": [                {                    "product_id": 1,                    "quantity": 10,                    "unit_price": 150.00,                    "discount": 2000.00                }            ]        }    ]}

class DiscountMustNotExceedLineTotalimplements ValidationRule, DataAwareRule{protectedarray$data = [];publicfunctionsetData(array$data):static    {$this->data =$data;return$this;    }publicfunctionvalidate(string$attribute,mixed$value,Closure$fail):void    {// $attribute = "orders.0.items.1.discount"// Need to extract indices and navigate the nested structurepreg_match('/^orders\.(\d+)\.items\.(\d+)\./',$attribute,$matches);$orderIndex =$matches[1] ??null;$itemIndex =$matches[2] ??null;if ($orderIndex ===null ||$itemIndex ===null) {return;        }$item =$this->data['orders'][$orderIndex]['items'][$itemIndex] ?? [];$lineTotal = ($item['quantity'] ??0) * ($item['unit_price'] ??0);if ($value >$lineTotal) {$fail("The discount cannot exceed the line total of{$lineTotal}.");        }    }}

class DiscountMustNotExceedLineTotalimplements ValidationRule, ScopeAwareRule{protectedarray$scope = [];publicfunctionsetScope(array$scope):static    {$this->scope =$scope;return$this;    }publicfunctionvalidate(string$attribute,mixed$value,Closure$fail):void    {$lineTotal = ($this->scope['quantity'] ??0) * ($this->scope['unit_price'] ??0);if ($value >$lineTotal) {$fail("The discount cannot exceed the line total of{$lineTotal}.");        }    }}