带有JavaScript对象的PHP数组到JavaScript

Question

If I have an array in JS like this:

{
 "car": "BMW",
 "count": 7 
}

I can generate it from PHP quite easy using this array:

array(
       'car' => 'BMW',
       'count' => 7,
)

and json_encode. This is not a problem.

But what if I have an array in JS like this:

{
   "center": new google.maps.LatLng(-34.397, 150.644),
   "zoom": 8
}

is there also some nice way how to produce it from PHP?

The method above fails because JSON put quotes around "new google.maps.LatLng(-34.397, 150.644)".

Answer 1

JSON doesn't support custom types. It's just meant for passing data and to be available to any consumer, whereas google.maps.LatLng() isn't really " data ."

So, you'll have to accomplish this in 2 steps:

1. You can include the values needed in another PHP array for the JSON:

    array( 'center' => array( 'lat' => -34.397, 'lng' => 150.644 ), 'zoom' => 8 ) 

    { "center": { "lat": -34.397, "lng": 150.644 }, "zoom": 8 } 

2. Then, once parsed to a JavaScript Object , say data :

    data.center = new google.maps.LatLng(data.center.lat, data.center.lng); 

   And, if there are numerous examples of such objects in the data, you can specify a reviver function to try to recognize them and create the instances:

    // parse, creating `google.maps.LatLng` from any { lat: ..., lng: ..., ... } var data = JSON.parse(jsonString, function (key, value) { if (typeof value === 'object' && value.lat && value.lng) { return new google.maps.LatLng(value.at, value.lng); } else { return value; } }); 

   Example: http://jsfiddle.net/XXbUU/

---

Side note: JSON and JavaScript make a stronger distinction between " array " types than PHP does.

• " Associative " array s in PHP become Object s in JSON and JavaScript.
• " Non-associative " array s in PHP become Array s in JSON and JavaScript.