Question

我试图从值数组中显示单个值。如果我使用print_r($arr)，则会显示此值

{
    "a": 14,
    "b": 3,
    "c": 61200,
    "d": [
        "2014-04-22 12:00:06",
        "2014-04-23 12:00:06",
        "2014-04-24 12:00:06"
    ]
}

但是当我尝试使用echo $arr->a和$arr['a']时。它显示illegal string offset 'a'。如何从值数组中获取单个值？

Answer 1

看起来像json所以需要首先使用json_decode()

进行解码

$d = '{"a":14,"b":3,"c":61200,"d":["2014-04-22 12:00:06","2014-04-23 12:00:06","2014-04-24 12:00:06"]}';
$j = json_decode($d);
echo '<pre>';
print_r($j);
echo $j->a;

Answer 2

试试这个

$arr = json_decode($arr);
echo $arr->a

Answer 3

从JSON解码：

$v = json_decode('{
    "a": 14,
    "b": 3,
    "c": 61200,
    "d": [
        "2014-04-22 12:00:06",
        "2014-04-23 12:00:06",
        "2014-04-24 12:00:06"
    ]
}');

echo $v->a;

Answer 4

输入看起来像JSON - 尝试以下方法来解析JSON数据：

$json_string = '{
    "a": 14,
    "b": 3,
    "c": 61200,
    "d": [
        "2014-04-22 12:00:06",
        "2014-04-23 12:00:06",
        "2014-04-24 12:00:06"
    ]
}';

$vals = json_decode($json_string);

echo $vals->a;

Answer 5

更多信息会很有用。什么版本的PHP正在使用？您使用的是Web引擎（Apache，Nginx等）还是命令行？如果我错了，请纠正我，但我假设你使用json_decode并将其作为一个对象。

$obj = json_decode('{"a":14,"b":3,"c":61200,"d":["2014-04-22 12:00:06","2014-04-23 12:00:06","2014-04-24 12:00:06"]}');
echo "Result: " . $obj->a;

Result: 14

这在PHP版本5.3,5.4,5.5中运行得很好

php - array - 非法字符串偏移量

5 个答案: