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做项目时发现一个小现象,使用json_encode()函数将array()数组转化成json,输出的数据格式有时候是“{}”包围的,有时候是“[]”包围的。下面做几个测试:
//对象
1 2 3 4 5 6 7 8 | class JsonTest{ public $id = 1; public $name = 'terry' ; public $sex = '男' ; } $obj = new JsonTest; echo json_encode( $obj ); |
输出结果:{“id”:1,”name”:”terry”,”sex”:”\u7537″}
//数字索引数组
1 2 3 | $arr1 = array (1, 'terry' , '男' ); echo json_encode( $arr1 ); |
输出结果:[1,”terry”,”\u7537″]
//关联数组
1 2 3 | $arr2 = array ( "id" => 1, "name" => 'terry' , "sex" => '男' ); echo json_encode( $arr2 ); |
输出结果:{“id”:1,”name”:”terry”,”sex”:”\u7537″}
//多维索引数组
1 2 3 | $arr3 = array ( array (1, 'terry' , '男' ), array (2, 'surfin' , '男' )); echo json_encode( $arr3 ); |
输出结果:[[1,”terry”,”\u7537″],[2,”surfin”,”\u7537″]]
//关联索引数组
1 2 3 | $arr4 = array ( array ( "id" =>1, "name" => 'terry' , "sex" => '男' ), array ( "id" =>2, "name" => 'surfin' , "sex" => '男' )); echo json_encode( $arr4 ); |
输出结果:[{“id”:1,”name”:”terry”,”sex”:”\u7537″},{“id”:2,”name”:”surfin”,”sex”:”\u7537″}]