jquery - How to convert html contents to json using PHP? -

i tried save html contents json formatting...

http://jsfiddle.net/usernan/2gwmp/

when clicking on #save button, html contents posted , storing json php.

[{     "container": [         {             "type": "title",             "data": 1,             "active": true,             "content": "content 1",             "description": "description 1",             "main": [                 {                     "type": "sub",                     "content": "content 2",                     "description": "description 2"                 },                 {                     "type": "sub",                     "content": "content 3",                     "description": null                 },                 {                     "type": "title",                     "data": 2,                     "active": false,                     "content": "content 4",                     "description": null,                     "main": [                         {                             "type": "sub",                             "content": "content 5",                             "description": "description 5"                         },                         {                             "type": "sub",                             "content": "content 6",                             "description": "description 6"                         },                         {                             "type": "title",                             "data": 3,                             "active": true,                             "content": "content 7",                             "description": null,                             "main": [                                 {                                     "type": "sub",                                     "content": "content 8",                                     "description": null                                 },                                 {                                     "type": "sub",                                     "content": "content 9",                                     "description": null                                 }                             ]                         }                     ]                 }             ]         },         {             "type": "sub",             "content": "content 10",             "description": "description 10"         },         {             "type": "title",             "data": 4,             "active": false,             "content": "content 11",             "description": null,             "main": [                 {                     "type": "title",                     "data": 5,                     "active": false,                     "content": "content 12",                     "description": null,                     "main": [                         {                             "type": "sub",                             "content": "content 13",                             "description": "description 13"                         }                     ]                 },                 {                     "type": "sub",                     "content": "content 14",                     "description": null                 }             ]         }     ] }] 

i not know how coding php solve problem.

if take @ problem , share bit of science, i'd grateful. thanks!