Edit value in a json from an array - php

Question

I hav an array like this:
Array
(
[fruit] => Banana
[country] => Canada
)
How can I update my json file with a loop with these new datas ?
My json is a file and it looks lile this:
{"fruit" : "Cherry", "country" : "Mexico", "weight" : "28"}
Note: I want to update the value fruit and country, not all the json.
Thanks.

Answer 1

As i said you can decode your json as an associative array (note the use of json_decode() with second parameter set on true), loop throw it and update it while iterating. Finally encode to json again as follow
$array = array('fruit' => 'Banana', 'country' => 'Canada');
$json = '{"fruit" : "Cherry", "country" : "Mexico", "weight" : "28"}';
$mjson = json_decode($json,true);
foreach($array as $key => $val) {
if(isset($mjson[$key])) {
$mjson[$key] = $val;
}
}
$jjson = json_encode($mjson);
print_r($jjson);
//Output: {"fruit":"Banana","country":"Canada","weight":"28"}
Live demo

Answer 2

$input = /** some json string **/
$json = json_decode($input, true); // to assoc array
// update values
$json["fruit"] = "Cherry";
$json["country"] = "Mexico";
$json["weight"] = "28";
$ouput = json_encode($json); // back to json
// save to file etc.
Does this help?

Answer 3

You can't directly edit the file like it is an object.
First you need to read the file, than decode json:
e.g:
$string='{"name":"John Adams"}';
$json_a=json_decode($string,true);
Remember if you use second parameter "true" in json_a you will get associative array. Something like this:
$json_a=array("name"=>"John Adams");
But if you want to have an object don't set second parameter:
$string='{"name":"John Adams"}';
$json_o=json_decode($string);
Here json_decode($string) returns an object. Now you can do this:
echo $json_o->name;
When you modify the json object, write it back to the file.