PHP - 检测嵌套数组中的重复值

Question

I'm using an API which returns some JSON that I output in PHP.

PHP

$result = $api->sendRequest("getUsers", $inputParameters);
$output = json_decode($result, true);

An example of an array returned by the API. I can print out specific field values fine, but I can't figure out how to write a simple if statement that indicates whether or not there are duplicate names within the query result, specifically duplicate [fullName] fields as seen below.

Array
(
    [status] => Array
        (
            [request] => getUsers
            [recordsTotal] => 3
            [recordsInResponse] => 3
        )

    [records] => Array
        (
            [0] => Array
                (
                    [fullName] => Smith, Tom
                    [firstName] => Tom
                    [lastName] => Smith

                )

            [1] => Array
                (
                    [fullName] => Jones, Bill
                    [firstName] => Bill
                    [lastName] => Jones
                )

            [2] => Array
                (
                    [fullName] => Smith, Tom
                    [firstName] => Tom
                    [lastName] => Smith
                )

        )

)

Any help would be greatly appreciated.

Answer 1

Not tested, but maybe try something like

function dupeCheck($array, $attribute = 'fullName') {
    $list = array();
    foreach($array['records'] as $value) {
        if(in_array($value[$attribute], $list))
            return true;
        $list[] = $value[$attribute];
    }
    return false;
}

Just iterating over the records, we maintain a list of values of whatever attribute, once it finds one that was already in the array, returns true.

Then just:

if(!dupeCheck($output, 'fullName')) { // no dupes in the API response }