How can run recursive function on multiple Level array in php - php

Question

I have two arrays one is $apiRes and second is $mappData i want to match fields exist in mappData array and assign value of apiRes to match field.
Note: response of api may have different and mapdata array will change according to api response My two array and output format :
<?php
$apiRes = [
[
'firstname' => 'first name des',
'title' => "title des",
'category' => 1,
'result' =>
[
0 => [
'name' => 'Masterpass',
'skill' => 'low level one'
],
1 => [
'name' => 'Visa',
'skill' => 'low level two'
],
2 => [
'name' => 'Pocketpos',
'skill' => 'low level three'
],
],
'list' => [
'product_name'=>'product name',
'amount' => [
'currency'=>'$',
'kind' => 'kind'
]
],
'priority' => 'Low',
'visible_to' => 'Everyone',
]
];
$mappData = [
0 => [
"src_field" => "firstname",
"target_field" => "new1519110449758",
"src_field_data_type" => "string"
],
1 => [
"src_field" => "result.name",
"target_field" => "new1519110811942",
"src_field_data_type" => "string"
],
2 => [
"src_field" => "list.product_name",
"target_field" => "new1519110451708",
"src_field_data_type" => "string"
],
3 => [
"src_field" => "list.amount.currency",
"target_field" => "new1517556165360",
"src_field_data_type" => "string"
]
];
My final output should be:
$output = [
"new1519110449758" => "first name des",
"new1519110451708" => "product name",
"new1517556165360" => "$",
"new1519110811942" => [
0 => "Masterpass",
1 => "Visa",
2 => "Pocketpos"
]
];
Please help
Thanks

Answer 1

I've changed your mappData slightly as it's difficult to know how to deal with the result.name element as it's repeated. What I've done is change it so that it's *result.name and it uses the fact there is an * in it to mean there are multiple values.
I've tried to comment the code with enough to explain each bit, the main principle is using a recursive routine to go through each level of the array one step at a time.
<?php
ini_set('display_errors', 'On');
error_reporting(E_ALL);
$apiRes = [
[
'firstname' => 'first name des',
'title' => "title des",
'category' => 1,
'result' =>
[
0 => [
'name' => 'Masterpass',
'skill' => 'low level one'
],
1 => [
'name' => 'Visa',
'skill' => 'low level two'
],
2 => [
'name' => 'Pocketpos',
'skill' => 'low level three'
],
],
'list' => [
'product_name'=>'product name',
'amount' => [
'currency'=>'$',
'kind' => 'kind'
]
],
'priority' => 'Low',
'visible_to' => 'Everyone',
]
];
$mappData = [
0 => [
"src_field" => "firstname",
"target_field" => "new1519110449758",
"src_field_data_type" => "string"
]
,
1 => [
"src_field" => "*result.name",
"target_field" => "new1519110811942",
"src_field_data_type" => "string"
],
2 => [
"src_field" => "list.product_name",
"target_field" => "new1519110451708",
"src_field_data_type" => "string"
],
3 => [
"src_field" => "list.amount.currency",
"target_field" => "new1517556165360",
"src_field_data_type" => "string"
]
];
$result = [];
// Process next element of the array
function getArrayElement ( $next, $data, $array = false ) {
// Extract key for this level
$key = array_shift($next);
// If starts with * then this means there are multiple of them
if ( $key[0] == "*" ){
$nextArray = true;
// remove from current key
$key = substr($key,1);
}
else {
$nextArray = false;
}
if ( $array ){
$res = [];
// extract the data from each element at this level
foreach ( $data as $read ) {
$res[] = $read[$key];
}
$data = $res;
}
else {
// Fetch the element for the key for this level
$data = $data [ $key ];
}
// If there are more levels to deal with then repeat this method
if ( count($next) > 0 ) {
$data = getArrayElement ( $next, $data, $nextArray );
}
return $data;
}
// Flatten out original array if necessary
if ( count($apiRes) == 1 ){
$apiRes = $apiRes[0];
}
// Process each part of lookup
foreach ( $mappData as $element ) {
// Create an array of the elments broken down into each level
$map = explode( '.', $element['src_field']);
$result[$element['target_field']] = getArrayElement($map, $apiRes);
}
print_r($result);