After learning about the simple factory pattern, i made up a problem scope and used the pattern to solve it.

simpleFactoryExample.php

<?php

//a boy has two shows and can decide to wear anyone of it at any time,
//the below class shows the implementation without applying any design patterns

class ShoeWithoutFactory
{
    const CHURCH = 1;
    const SCHOOL = 2;

    public function putOn($flag)
    {
        switch($flag)
        {
            case self::CHURCH:
                echo "polish shoes, put shoes on, and tie show lace \n";
                break;

            default:
                echo " clean the straps, wear socks and hit the ground to see it sits well on the sole \n";
                break;
        }
    }

    public function pullOff($flag)
    {
        switch($flag)
        {
            case self::CHURCH:
                echo "Kick the devil out of the shoes 😀, keep it aside \n";
                break;

            default:
                echo "put the show aside and be good \n";
                break;
        }
    }
}

//using the simple factory design pattern, we clean up the above code and make it clean and maintainable
//though it is worthy to mention that the simple factory pattern breaks the Open for extension and closed 
//for Modification rule of the SOLID principles, but we can live with that.

abstract class Shoe
{
    const CHURCH = 1;
    const SCHOOL = 2;

    public static function make($flag)
    {
        switch($flag)
        {
            case self::CHURCH:
                return new ChurchShoe();
                break;

            default:
                return new SchoolShoe();
                break;
        }
    }

    public function putOn()
    {
        echo 'putting on "' . __CLASS__ . '" shoes';
    }

    public function pullOff()
    {
        echo 'pulling off "' . __CLASS__ . '" shoes';
    }
}

class ChurchShoe extends Shoe
{

    public function putOn()
    {
        echo "polish shoes, put shoes on, and tie show lace \n";
    }

    public function pullOff()
    {
        echo "Kick the devil out of the shoes 😀, keep it aside \n";
    }
}

class SchoolShoe extends Shoe
{
    public function putOn()
    {
        echo " clean the straps, wear socks and hit the ground to see it sits well on the sole \n";
    }

    public function pullOff()
    {
        echo "put the show aside and be good \n";
    }
}

class Dressup
{
    private $shoe;

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

    public function dripUp()
    {
        //wear shirt
        //wear pants
        $this->shoe->putOn();

    }

    public function dripDown()
    {
        //remove shirt
        //remove pants
        $this->shoe->pullOff();

    }

}

$alfredToSchool = new Dressup(Shoe::make(Shoe::SCHOOL));
$alfredToChurch = new Dressup(Shoe::make(Shoe::CHURCH));

$alfredToSchool->dripUp();
$alfredToSchool->dripDown();
echo "\n \n ---BREAK--- \n\n";
$alfredToChurch->dripUp();
$alfredToChurch->dripDown();