$result = [
"object" => ["a" => 1],
"array" => [1,2,3,4,5],
"empty_object0" => new stdclass(),
"empty_object1" => new arrayobject(),
"empty_object2" => (object)[],
"empty_array" => [],
"array_object" => [
["a" => 1],
["b" => 2]
]
];
echo json_encode($result);
结果：
{
"object":{"a":1},
"array":[1,2,3,4,5],
"empty_object0":{},
"empty_object1":{},
"empty_object2":{},
"empty_array":[],
"array_object":[{"a":1},{"b":2}]
}
