What alternative of code that work in PHP7 in PHP5

Question

I have a PHP code which runs on PHP7 but not in PHP 5, which PHP version in my server, that is my code:

Array (
    [0] => stdClass Object (
        [userId] => 15
        [name] => name0
        [userName] => hh
        [centerName] => center10
    )

    [1] => stdClass Object (
        [userId] => 16
        [name] => name1
        [userName] => test
        [centerName] => center10
    )

    [2] => stdClass Object (
        [userId] => 1
        [name] => name2
        [userName] => ll
        [centerName] => center1
    )
)

$ids = array_unique(array_column($results, 'centerName'));
print_r($ids);

I get what I expected in PHP7 but I get an empty array in PHP5.

How can I adapt my code to work in PHP5?

Answer 1

As from manual, ability to use array of objects as parameter to array_column is added since php7.0.

In php5 you simply cannot use array_column to get columns from array of objects. So, you need to use some other code, a simple foreach for example:

$uniqueValues = [];
foreach ($results as $item) {
    $uniqueValues[$item->centerName] = 1;
}
print_r(array_keys($uniqueValues));