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8 years ago
You can use the array functions on a object of a class that implements ArrayAccess using the __invoke magic method in this way:

<?php
class ArrayVar implements ArrayAccess
{
    private $data = [];

    public function __invoke()
    {
        return $this->data;
    }
}
?>

Now you can use it in this way:
<?php
    $arrayar = new ArrayVar();
    $arrayar['one'] = 'primer';
    $arrayar['two'] = 'segon';
    $arrayar['three'] = 'tercer';

    $keys = array_keys($arrayar());
    var_dump($keys);
    // array (size=3)
    //    0 => string 'one'
    //    1 => string 'two' 
    //    2 => string 'three'

    $diff = array_diff($arrayar(), [ 'two' => 'segon']);
    var_dump($diff);
    // array (size=2)
    //    'one' => string 'primer'
    //    'three' => string 'tercer'
?>
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