Merging two JSON by adding their value - php

Question

I am trying to merge two JSON , but instead of overwriting the value if it is found, I want to ADD the value if it is found For exemple, assuming I have tje following three values.
$a = "[{"base":"10","touch":true,"flatfooted":true}]"
$b = "[{"natural armor":"2","touch":false,"flatfooted":true}]"
$c = "[{"natural armor":"3","touch":false,"flatfooted":true}]"
I would like to get the following result:
"[{"base":"10","touch":true,"flatfooted":true},{"natural armor":"5","touch":false,"flatfooted":true}]"
But I'm getting lost in the way.
Thank you for the help.
Also, asking in advance to avoid asking in another question: How can I turn every JSON object into a different array?
Assuming the result JSON, something like
$final[0]['base'] = 10,
$final[0]['touch'] = true,
$final[0]['flatfooted'] = true,
$final[1]['natural armor'] = 5,
$final[1]['touch'] = false,
$final[1]['flatfooted'] = true

Answer 1

Here's a start, I can't finish it because I have to leave. Good luck!
<?php
$a = '[{"base":"10","touch":true,"flatfooted":true}]';
$b = '[{"natural armor":"2","touch":false,"flatfooted":true}]';
$c = '[{"natural armor":"3","touch":false,"flatfooted":true}]';
//Decode values to arrays and get first item.
$a = json_decode($a, true)[0];
$b = json_decode($b, true)[0];
$c = json_decode($c, true)[0];
//Put them all in a array
$abc = [$a, $b, $c];
//Compare keys of all arrays, and put the ones with no diffs in a array
$noDiff = [];
foreach ($abc as $idx => $character) {
//Skip first because we use it in the foreach
for ($i = 1; $i < count($abc); $i++) {
$diff = array_diff_key($character, $abc[$i]);
if (empty($diff)) {
$noDiff[] = $character;
$noDiff[] = $abc[$i];
}
}
//Remove item from $abc and reset index keys
array_splice($abc, $idx, 1);
}
//$noDiff will now contain array $b and $c and we know they both have the same keys.
//We need to be sure natural armor contains numeric values and that touch and flatfooted
//have both the same boolean value.
$merged = [];
$canCombine = true;
foreach ($noDiff[0] as $key => $value) {
if (!is_numeric($value) || is_numeric($noDiff[1][$key]) {
$canCombine = false;
} else {
}
}
echo "<pre>";
var_dump(
$noDiff
);
echo "</pre>";

Answer 2

You can turn any JSON string into an array using:
$result = json_decode($jsonString,true) ;
If you want each JSON string to end up as a separate element of an array you can use:
$final[] = json_decode($jsonString,true) ;
So, in your case you could use:
$final[] = json_decode($a,true) ;
$final[] = json_decode($b,true) ;
$final[] = json_decode($c,true) ;
Though I would recommend a loop in case you don't always have three (e.g., $a, $b & $c).
You should always check json_last_error() after each json_decode() to make sure you didn't generate an error.

Answer 3

Since JSON is serialized data, you need to parse the two json objects you need to merge, then add the result of any fields, then you can update the values of one of your original json objects and serialize the data.
I haven't used PHP before, but here is an article I found on parsing json objects in PHP. http://php.net/manual/en/function.json-decode.php
Hope that helps.

Answer 4

1) Same AC bonuses DO NOT stack. That means you can't add two natural armors for one unit. You can however do (base + dexterity + natural + size + armor + shield)
2) Why are "touch" and "flat footed" booleans? You just add different subsets of AC
touch = base + dexterity + natural + size
flat footed = base + armor + shield
3) In case you are indeed talking about DnD, I hope you want to make a tool for yourself and your friends to use, cause you can't just publish a tool for DnD, it's copyrighted.