Solution: Static references

(chimes)…- [Instructor] I hope that you had success…in completing the static references challenge.…Now let me show the solution that I came up with.…The first thing I did was set up for the challenge,…which meant going into challenge_03.php…and grabbing both the Bicycle class and the Unicycle class…and putting those into a new file called challenge_04.php.…Then I can start the different parts of the challenge.…The first thing was to add a new property called…$instance_count to make it a static property,…and also of course I want to make it public…so that it has visibility.…

It's always a best practice…to have visibility in front of these.…I also gave it a good default value, which was zero,…so we'll start this counter at zero,…and every time we create a new instance,…we're going to increment that counter.…We're also going to define a new method.…It's a static method,…I've also said that it should be public.…And it's going to be called create,…so I can call that on either class,…on my Bicycle class or on the subclass.…