Edit json file with php - php

Question

i have a json file structured this way:
{
"data": {
"Category": {
"Product1": [{
"Code": "abc"
}],
"Product2": [{
"Code": "cba"
}]
},
"Category2": {
"Product3": [{
"Code": "abcabc"
}],
"Product4": [{
"Code": "cbacba"
}]
},
"Category3": {
"Product5": [{
"Code": "abcabcabc"
}],
"Product6": [{
"Code": "cbacbacba"
}]
}
}
}
How can i change the category names with a php script?
for example if i have 2 variables received from a form, called "$oldcategory" (which will be one of the existing categories) and "$newcategory" how can it, open the json file, place "$newcategory" where "$oldcategory" is and re-save the file?
<?php
$oldcategory= $_POST['oldcategory'];
$newcategory= $_POST['newcategory'];
$jsonString = file_get_contents('data.json');
$data = json_decode($jsonString, true);
...
foreach($data["data"] as $key=>$value){
$new = $data["data"][$oldcategory];
$data["data"][$newcategory]= $new ;
}
unset($data["data"][$oldcategory]);
$newJsonString = json_encode($data);
file_put_contents('data.json', $newJsonString);
?>
in case i was changing the "Category2" i'd like the result to be:
{
"data": {
"Category": {
"Product1": [{
"Code": "abc"
}],
"Product2": [{
"Code": "cba"
}]
},
"New_Category2": {
"Product3": [{
"Code": "abcabc"
}],
"Product4": [{
"Code": "cbacba"
}]
},
"Category3": {
"Product5": [{
"Code": "abcabcabc"
}],
"Product6": [{
"Code": "cbacbacba"
}]
}
}
}
instead of this:
{
"data": {
"Category": {
"Product1": [{
"Code": "abc"
}],
"Product2": [{
"Code": "cba"
}]
},
"Category3": {
"Product5": [{
"Code": "abcabcabc"
}],
"Product6": [{
"Code": "cbacbacba"
}]
},
"New_Category2": {
"Product3": [{
"Code": "abcabc"
}],
"Product4": [{
"Code": "cbacba"
}]
}
}
}
This was a possible solution:
foreach($data["data"] as $key=>$value){
if ($key == $oldcategory){
$key = $newcategory;}
$new["data"][$key] = $value;
}
$newJsonString = json_encode($new);
file_put_contents('data.json', $newJsonString);

Answer 1

This ended up being the solution to my problem:
<?php
$oldcategory= $_POST['oldcategory'];
$newcategory= $_POST['newcategory'];
$jsonString = file_get_contents('data.json');
$data = json_decode($jsonString, true);
...
foreach($data["data"] as $key=>$value){
if ($key == $oldcategory){
$key = $newcategory;}
$new["data"][$key] = $value;
}
$newJsonString = json_encode($new);
file_put_contents('data.json', $newJsonString);
?>

Answer 2

You could use a conditional, and create a new array with the desired values. When you reach the $oldcategory in your loop, replace the key with the $newcategory.
$newArray = [];
foreach($data["data"] as $key=>$value){
if($key == $oldcategory) {
$newArray[$newcategory] = $value;
} else {
$newArray[$key] = $value;
}
}
$newJsonString = json_encode($newArray);