If you have an indexed array of objects, and you want to remove duplicates by comparing a specific property in each object, a function like the remove_duplicate_models() one below can be used.

remove-duplicate-objects-from-array.php

<?php

class Car {
    private $model;

    public function __construct( $model ) {
        $this->model = $model;
    }

    public function get_model() {
        return $this->model;
    }
}

$cars = [
    new Car('Mustang'),
    new Car('F-150'),
    new Car('Mustang'),
    new Car('Taurus'),
];

function remove_duplicate_models( $cars ) {
    $models = array_map( function( $car ) {
        return $car->get_model();
    }, $cars );

    $unique_models = array_unique( $models );

    return array_values( array_intersect_key( $cars, $unique_models ) );
}

print_r( remove_duplicate_models( $cars ) );

Saved my day!

Is it necessary to use array_values function on line 29 on php 7+ ?

@amrography Glad to hear it :)

Yes, I would leave in the array_values(). Without that, the array indices of the example above end up being 0, 1, and 3. array_values() serves as a reset for the indices, so if you include it, they end up being 0, 1, and 2.

@kellenmace
Thanks you!