php 判断字符串是不存在json中

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<script src="Public/Home/js/jquery-1.11.1.min.js"></script> <script> function  addree() {     var myDate = new Date();     var t='10-01';                     var arr = {"元旦":"01-01", "劳动节":"05-01","国庆节":"10-01" ,"圣诞节":"12-25"};            for (var items in arr)            {                if(arr[items]==t)                {                   var c=1;                  break;                 }                 else                 {                                           c=0;                                        }                           }     alert(c); } </script> <button  onclick="addree();" style="width:50px; height:50px;">点击</button>

　　

如果c=1的时候  证明存在，否则不存在！