How to encode below json with php
'{ "chart": { "caption": "Actual Revenues, Targeted Revenues & Profits", "subcaption": "Last year", "xaxisname": "Month", "yaxisname": "Amount (In USD)", "numberprefix": "$", "theme": "zune" },
"categories": [ { "category": [ { "label": "Jan" }, { "label": "Feb" }, { "label": "Mar" }, { "label": "Apr" }, { "label": "May" }, { "label": "Jun" }, { "label": "Jul" }, { "label": "Aug" }, { "label": "Sep" }, { "label": "Oct" }, { "label": "Nov" }, { "label": "Dec" } ] } ],
"dataset": [ { "seriesname": "Actual Revenue", "data": [ { "value": "16000" }, { "value": "20000" }, { "value": "18000" }, { "value": "19000" }, { "value": "15000" }, { "value": "21000" }, { "value": "16000" }, { "value": "20000" }, { "value": "17000" }, { "value": "25000" }, { "value": "19000" }, { "value": "23000" } ] },
{ "seriesname": "Projected Revenue", "renderas": "line", "showvalues": "0", "data": [ { "value": "15000" }, { "value": "16000" }, { "value": "17000" }, { "value": "18000" }, { "value": "19000" }, { "value": "19000" }, { "value": "19000" }, { "value": "19000" }, { "value": "20000" }, { "value": "21000" }, { "value": "22000" }, { "value": "23000" } ] },
{ "seriesname": "Profit", "renderas": "area", "showvalues": "0", "data": [ { "value": "4000" }, { "value": "5000" }, { "value": "3000" }, { "value": "4000" }, { "value": "1000" }, { "value": "7000" }, { "value": "1000" }, { "value": "4000" }, { "value": "1000" }, { "value": "8000" }, { "value": "2000" }, { "value": "7000" } ] } ] }');