How to write content as JSON format - php

Question

I have a trouble with JSON in PHP.
I have a JSON structure like this (with some line is const and some line is variable)
{
"user": {
"lam": {---->variable
"\/lam\/files\/a": { ---->variable
"id": 9, ---->variable
"class": "\\OC\\Files\\Storage\\Swift",
"options": {
"user": "owncloud",
"bucket": "lam-15215156681752265498", ---->variable
"password": "",
"region": "regionOne",
"service_name": "swift",
"tenant": "owncloud",
"timeout": "30",
"url": "http:\/\/controller:5000\/v2.0",
"password_encrypted": "NHBuZHd4azhvZDB6b29oYSu5U7JLrDC3AdZGykzNpDU=" ---->variable
}
}
}
}
}
I don't know how to write this content to file as JSON format like this.
And in a number of case, I must write append to this file and result must like this:
{
"user": {
"lam": {
"\/lam\/files\/a": {
"id": 9,
"class": "\\OC\\Files\\Storage\\Swift",
"options": {
"user": "owncloud",
"bucket": "lam-15215156681752265498",
"password": "",
"region": "regionOne",
"service_name": "swift",
"tenant": "owncloud",
"timeout": "30",
"url": "http:\/\/controller:5000\/v2.0",
"password_encrypted": "NHBuZHd4azhvZDB6b29oYSu5U7JLrDC3AdZGykzNpDU="
}
},
"\/lam\/files\/test": {
"id": 12,
"class": "\\OC\\Files\\Storage\\Swift",
"options": {
"user": "owncloud",
"bucket": "lam-152153961597103330",
"password": "",
"region": "regionOne",
"service_name": "swift",
"tenant": "owncloud",
"timeout": "30",
"url": "http:\/\/controller:5000\/v2.0",
"password_encrypted": "MjdzcDlrenptcG5udzI2MLSQvuGIczY\/SyHZVf9o7e8="
}
}
}
}
}

Answer 1

You could create an array, before to use json_encode():
Here is an example.
// prepare an array with variable (should come from database, or whatever)
$vars = [
[
'user' => 'lam',
'path' => '/lam/files/a',
'id' => 9,
'bucket' => 'lam-15215156681752265498',
'pass' => 'NHBuZHd4azhvZDB6b29oYSu5U7JLrDC3AdZGykzNpDU=',
],
[
'user' => 'lam',
'path' => '/lam/files/test',
'id' => 12,
'bucket' => 'lam-152153961597103330',
'pass' => 'MjdzcDlrenptcG5udzI2MLSQvuGIczY/SyHZVf9o7e8=',
]
];
// prepare data to be encoded.
$data = [];
// iterate over the variables,
foreach ($vars as $var) {
// prepare an array for the options
$options = [
"user" => "owncloud",
"bucket" => $var['bucket'], // fill with current variable
"password" => "",
"region" => "regionOne",
"service_name" => "swift",
"tenant" => "owncloud",
"timeout" => "30",
"url" => "http:\/\/controller:5000\/v2.0",
"password_encrypted" =>$var['pass'], // fill with current variable
];
$userdata = [
'id' => $var['id'], // fill with current variable
'class' => '\\OC\\Files\\Storage\\Swift',
'options' => $options, // append options
];
$name = $var['user'];
$path = $var['path'];
$data['user'][$name][$path] = $userdata ; // append to $data array
}
echo json_encode($data, JSON_PRETTY_PRINT);
Outputs:
{
"user": {
"lam": {
"\/lam\/files\/a": {
"id": 9,
"class": "\\OC\\Files\\Storage\\Swift",
"options": {
"user": "owncloud",
"bucket": "lam-15215156681752265498",
"password": "",
"region": "regionOne",
"service_name": "swift",
"tenant": "owncloud",
"timeout": "30",
"url": "http:\\\/\\\/controller:5000\\\/v2.0",
"password_encrypted": "NHBuZHd4azhvZDB6b29oYSu5U7JLrDC3AdZGykzNpDU="
}
},
"\/lam\/files\/test": {
"id": 12,
"class": "\\OC\\Files\\Storage\\Swift",
"options": {
"user": "owncloud",
"bucket": "lam-152153961597103330",
"password": "",
"region": "regionOne",
"service_name": "swift",
"tenant": "owncloud",
"timeout": "30",
"url": "http:\\\/\\\/controller:5000\\\/v2.0",
"password_encrypted": "MjdzcDlrenptcG5udzI2MLSQvuGIczY\/SyHZVf9o7e8="
}
}
}
}
}

Answer 2

You'll need to work with the data as an array (or object) as PHP won't work directly in JSON;
Get your current data from the file into an array:
$data = json_decode(file_get_contents($pathtojsonfile, true));
Append the new data to the array:
$data[] = $newdata;
Then save the newly appended data back to file.
file_put_contents($pathtojsonfile, json_encode($data));