php - 複数回および複数回のネストされた配列の配列でJSONオブジェクトを作成する方法は?

Question

$data=array
(
    "Maths" : [ 
        {
            "Name"  : "ramesh",        // First element
            "Marks" : 67,
            "age"   : 23
        }, {
            "Name"  : "mayur",    // Second element
            "Marks" : 65,
            "age"   : 21
        }
    ], 
"Science" : [
        {
            "Name"  : "ram",     // First Element
            "Marks" : 56,
            "age"   : 27
        },
        {
            "Name"  : "Santosh",    // Second Element
            "Marks" : 78,
            "age"   : 41
        }
   ]
);