PHP in_array object comparing?

Question

Can the in_array function compare objects?

For example, I have an array of objects and I want to add them distinctly to another array. Is it possible t

Answer 1

The in_array function cannot compare objects.

You should create unique key-value pairs from your objects and only need to compare those keys when inserting a new object into your final array.

Assuming that each object has an unique id property, a possible solution would be:

$unique_objects = array();

// $data represents your object collection
foreach ($data as $item) {
    if (!array_key_exists($item->id, $unique_objects)) {
        $unique_objects[$item->id] = $obj;
    }
}