array_unique on JSON objects

Question

$accountData                    = json_decode(file_get_contents($filetxt_1), true);
$newdata['id']                  = $uvon;
$newdata['wallet_address']      = $walletaddress;
$newdata['timestamp']           = time();
$accountData[]         = $newdata;
$array = array_values(array_unique( $accountData, SORT_REGULAR));
file_put_contents($filetxt_1, json_encode($array, JSON_PRETTY_PRINT));

Every time this PHP script is triggered by a $_POST, it is supposed to add a new JSON object to a file on the server. This works fine, except I need those objects to remain unique. I am attempting to achieve this with the array_unique and array_values functions.

After entering two sets of data containing a matching value, the output is this:

[
  {
      "id": "111.222.333.44",
      "wallet_address": "0x34c957891d19c88bc11e56c4ad6b1a65f09fda92",
      "timestamp": 1522101535
  },
  {
      "id": "111.222.333.44",
      "wallet_address": "0x3b958949efcc8362dd05179cce8eb5e16befebda",
      "timestamp": 1522101581
  }
]

The id's match, so the second object is not supposed to be in the file. Only if the id,wallet_address, and timecode are unique should the data be appended to the file.

checking only if the id exist can solve your issue or do you have to check also wallet_address? — Syscall
– Syscall, Commented Mar 26, 2018 at 22:26
Both wallet address and ID have to remain unique for this application. — Charles Raiser
– Charles Raiser, Commented Mar 26, 2018 at 22:40

Syscall · Accepted Answer · 2018-03-26 22:42:33Z

1

You could check if the $uvon is already present in the id values by getting all id values (using array_column()), and check if the value is present or not, before to update the JSON file (and the same for wallet_address):

$accountData = json_decode(file_get_contents($filetxt_1), true);
$ids = array_column($accountData, 'id');
$was = array_column($accountData, 'wallet_address');
if (!in_array($uvon, $ids) && !in_array($walletaddress, $was)) {
    $newdata['id']                  = $uvon;
    $newdata['wallet_address']      = $walletaddress;
    $newdata['timestamp']           = time();
    $accountData[]         = $newdata;
    file_put_contents($filetxt_1, json_encode($accountData, JSON_PRETTY_PRINT));
}

The function array_unique() can only reduce an array of "not-complex" values. Ex:

$array = [2,3,4,5,5,5,6,"foo","bar","foo"];
$array = array_unique($array);

Then $array will contains [2,3,4,5,6,"foo","bar].

answered Mar 26, 2018 at 22:42

Syscall

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1 Comment

Syscall Over a year ago

@CharlesRaiser You're welcome :) Don't forget to close your question if an answer solves your problem. Thanks :) See: meta.stackexchange.com/questions/5234/…

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