PHP Convert MYSQL Result To JSON

Create PHP script that will convert MySQL array to JSON formatted needed. Simple and quick project, I need to convert a MySQL array to JSON formatted as specified. MySQL Array example : [{"campaign_id":"4","variant_id":"6","triggers":"{"frequency":"168","exit":"standard","scroll":"100"}"},{"campaign_id":"4","variant_id":"7","triggers":"{"frequency":"168","exit":"standard","scroll":"100"}"},{"campaign_id":"4","variant_id":"11","triggers":"{"frequency":"168","exit":"standard","scroll":"100"}"},{"campaign_id":"4","variant_id":"12","triggers":"{"frequency":"168","exit":"standard","scroll":"100"}"},{"campaign_id":"4","variant_id":"13","triggers":"{"frequency":"168","exit":"standard","scroll":"100"}"},{"campaign_id":"4","variant_id":"15","triggers":"{"frequency":"168","exit":"standard","scroll":"100"}"},{"campaign_id":"4","variant_id":"17","triggers":"{"frequency":"168","exit":"standard","scroll":"100"}"},{"campaign_id":"4","variant_id":"25","triggers":"{"frequency":"168","exit":"standard","scroll":"100"}"},{"campaign_id":"16","variant_id":"31","triggers":"{"frequency":"72","exit":"standard","scroll":"100"}"},{"campaign_id":"17","variant_id":"32","triggers":"{"frequency":"72","pages":"6","scroll":"75"}"}] Result Formatted needed: { "campaigns": [{ "campaign_1": { "variant_1": { "scrollConfig": true, "scroll_val": 50, "exit": true }, "variant_2": { "scrollConfig": true, "scroll_val": 50, "exit": true } }, "campaign_2": { "variant_1": { "specificPage": true, "page": "[login to view URL]" }, "variant_2": { "specificPage": true, "page": "[login to view URL]" } }, "campaign_3": { "variant_1": { "pageCount": true, "count": "3" } }, "campaign_4": { "variant_1": { "timedCount": true, "timer": 30 }, "variant_2": { "timedCount": true, "timer": 30 } } }] }