Parse multi level json data with php - php

Question

{
"books": [
{
"id": 2331,
"image": "http://lol.org/flower.png",
"images": [
{
"256x144": "http://lol.org/bee.png",
"650x320": "http://lol.org/fly.png"
}
],
....
I have json data like above but my problem is how to get out 650x320 data.
$data = json_decode($jsondata,true);
$gg = sizeof($data['books']);
for($x=0;$x<$gg;$x++){
Codes below works fine
$image = $data['books'][$x]['image'];
but how to fetch images on a second json level? I have tried code below with no luck.
$image = ($data->{'books'}->{'images'}->{'320x180'});
$image = $data['books']['images'][$x]['320x180'];

Answer 1

function getImageLinksFor($json, $dimension='650x320') {
$links = array();
$objJson = json_decode($json);
// GET THE MAIN BOOKS OBJECT...
$books = $objJson->books;
// LOOP THROUGH THE $books OBJECT AND PERFORM YOUR SEARCH FOR IMAGES
foreach ($books as $obj) {
// SINGLE OUT THE IMAGES OBJECT
$images = $obj->images;
// SINCE IT IS ALSO AN ARRAY, SIMPLY LOOP THROUGH IT AND FETCH THE DESIRED DIMENSION.
foreach ($images as $key => $objImgData) {
if(property_exists($objImgData, $dimension)){
$links[] = $objImgData->$dimension;
}
}
}
if(count($links) == 1){
return implode("", $links);
}
return $links;
}
var_dump(getImageLinksFor($json, '650x320'));

Answer 2

'books' is an Array of objects, you will need to select an object using a numeric index.
$image = $data['books'][$insertIndexHere]['images'][$insertIndexHere]['320x180'];
Essentially you have missed the [$x] between 'books' and 'images' from your first code which works.
You will probably want a loop which iterates through each book and then a second nested loop which iterates through the images in each book.
For example:
$gg = sizeof($data['books']);
for($x=0;$x<$gg;$x++) {
$images = data['books'][$x]['images'];
$sizeOfImages = sizeof($images);
for($j = 0; $j < $sizeOfImages; $j++) {
// access $images[$j]['320x180']
}
}