Description:
------------
If a class defines a __equals($other) function, invoke that function on object comparison. Example:

==========================
class MyClass {
    public function __construct($value) {
        $this->value = $value;
    }

    /**
     * This function should be invoked on object
     * comparison with == or != operators.
     */
    public function __equals($other) {
        if ($other instanceof MyClass) {
            return ((int)$this->value
                   == (int)$other->value);
        } else {
            return false;
        }
    }

    private $value;
}

$a = new MyClass(3.14);
$b = new MyClass(3.13);

if ($a == $b) {
    echo '$a equals $b';
}
==========================

The comparison of $a and $b should result in the invokation of __equals function of MyClass. The same should apply to the != (not equals) operator.