PHP: Read JSON file with multiple objects in array and split by objects

Question

I have a file with content similar to this:

[{"color":1,"blocks":[[{"id":64}]]},{"color":1,"blocks":[[{"id":64},{"id":64}],[{"id":1}]]},{"color":2,"blocks":[[{"id":64},{"id":64}],[{"id":1}]]}]

For example the file above has 3 objects with elements: color and blocks. I am searching for an easy way with PHP to output only one object of the file. (remove outer []-brackets and split first level {}-brackets into different elements of an array or different strings or something)

The result should be for object1

{"color":1,"blocks":[[{"id":64}]]}

or for object2

{"color":1,"blocks":[[{"id":64},{"id":64}],[{"id":1}]]}

How to say PHP take the string and split it for each {"color" it can find into parts or by using the first level {}-brackets?

at the moment I am using $config=json_decode($file,true); and my code is like echo '{"color":'.$config[2]["color"].'"blocks" ... but thats crazy the object has too many elements i need a way like echo $config[2] that outputs {"color":2,"blocks":[[{"id":64},{"id":64}],[{"id":1}]]}

I tried to read the file as string and use explode but "}," or "color" as delimiter does not work and I can't find a valid delimiter.

Marc B · Accepted Answer · 2015-11-05 18:34:48Z

3

You're going about it wrong. You don't output json, you extract the sub-array/object and then re-encode that. e.g.

$foo = json_decode($your_json);
$temp = $foo['bar'][1]['baz']; // deep sub-data
echo json_encode($temp);

No substring operations/mangling required. Just decode, extract, re-encode extracted portion.

answered Nov 5, 2015 at 18:34

Marc B

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Paul Carlton · Accepted Answer · 2015-11-05 18:38:05Z

0

Decode then encode:

$str = '[{"color":1,"blocks":[[{"id":64}]]},{"color":1,"blocks":[[{"id":64},{"id":64}],[{"id":1}]]},{"color":2,"blocks":[[{"id":64},{"id":64}],[{"id":1}]]}]';
$config = json_decode($str, true);
$json = json_encode($config[2]);
print $json;

This will print what you want.

answered Nov 5, 2015 at 18:38

Paul Carlton

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