我有生辰八字的阵列阵列接收来自Facebook充满所以有一些朋友卫生组织生日是私人所以它包含NULL如何数组像空字符串转换,只要有空值的数组类似于下面
"<null>",
"10/29/1988",
"11/13",
"03/24/1987",
"04/25/1990",
"03/13",
"01/01",
"<null>",
"12/15/1905",
"07/10",
"11/02/1990",
"12/30/1990",
"<null>",
"07/22/1990",
"01/01",
"07/17/1989",
"08/28/1990",
"01/10/1990",
"06/12/1990",