Description:
------------
"Warning: Declaration of * should be compatible with"

In the real world abstracted features work this way all the time.  This warning is an arbitrary and artificial idea that has no basis in the real world.

PHP Warning:  Declaration of combinationLock::unlock($combination) should be compatible with abstractLock::unlock() in test.php on line 23

PHP Warning:  Declaration of paddleLock::unlock($key) should be compatible with abstractLock::unlock() in test.php on line 32


Test script:
---------------
<?php
class abstractLock
{
    private $locked = true;
    public function unlock()
    {
       $this->locked=false;
    }
    public function lockStatus()
    {
        if($this->locked) return "Locked\n";
        else return "Unlocked\n";
    }
}

class combinationLock extends abstractLock
{
    private $combination = '32-10-21'; // combination
    public function unlock($combination)        // unlock WITH combination
    {
        if($this->combination == $combination) parent::unlock();
    }
}

class paddleLock extends abstractLock
{
    private $key = '100,70,80,30,50,90,60,40,100'; // ridge heights
    public function unlock($key)                            // unlock WITH key
    {
        if($this->key == $key) parent::unlock();
    }
} 

$lock1 = new paddleLock();
echo "paddleLock is " . $lock1->lockStatus();
$lock1->unlock('100,70,80,30,50,90,60,40,100');
echo "paddleLock is " . $lock1->lockStatus();

$lock2 = new combinationLock();
echo "combinationLock is " . $lock2->lockStatus();
$lock2->unlock('32-10-21');
echo "combinationLock is " . $lock2->lockStatus();
?>

Expected result:
----------------
No warning about things that happen all the time in the real world.