PHP How to properly merge arrays for following json structure - php

Question

So i tried a lot of possible codes out but i can't seem to find a proper solution.
First let's start with the the wished array (i will show it in a json format as it's easier to read)
{
"transaction": {
"input": [
{
"address": "a",
"value": 4294967295
},
{
"address": "b",
"value": 51515
}
],
"output": [
{
"address": "aa",
"value": 551
},
{
"address": "bb",
"value": 66564
}
]
}
}
I'm using 2 foreach loops to get data that i wanna put in inputs & outputs
Here's the code im using:
//Get Output Addresses & Value
$tmp_array = array();
foreach($json['result']['vout'] as $a)
{
$value = $a['value'];
$address = $a['scriptPubKey']['addresses'][0];
$tmp_array = array('wallet' => $address, 'value' => $value);
$input = array_merge($input, $tmp_array);
};
$input = array('inputs' => $tmp_array);
$input = json_encode($input);
print_r($input);
That's the code for me getting the data and trying to put it into the array. Now i have a problem, it only adds data from the last iteration of the loop. I'm trying to get a code that gets it in a strucuture like above. Whatever solution gets sent, it should be applicable so i can paste the same code in the other loop that is for the outputs

Answer 1

You are assigning the $input variable after the loop with the value of $tmp_array which will be the value from the last iteration, as you described. To fix this you should initialize the $input array as empty array at the beginning and merge that with the new data:
//Get Output Addresses & Value
$inputs = array();
foreach($json['result']['vout'] as $a)
{
$value = $a['value'];
$address = $a['scriptPubKey']['addresses'][0];
$tmp_array = array('wallet' => $address, 'value' => $value);
$inputs[] = $tmp_array; // push to array
};
$input = json_encode(array('inputs' => $inputs));
print_r($input);