php怎么采集json指定的内容

例如，假设有以下JSON数据：

```json

{

"name": "John",

"age": 30,

"city": "New York"

}

```

可以使用以下代码来采集指定的内容：

```php

$jsonData = 'https://www.yisu.com/ask/{

"name": "John",

"age": 30,

"city": "New York"

}';

$data = https://www.yisu.com/ask/json_decode($jsonData);

$name = $data->name;

$age = $data->age;

$city = $data->city;

echo "Name: " . $name . "
";

echo "Age: " . $age . "
";

echo "City: " . $city . "
";

```

输出结果：

```

Name: John

Age: 30

City: New York

```

另外，如果JSON数据是一个包含多个元素的数组，可以使用`foreach`循环来遍历和采集每个元素的内容。