カテゴリー: PHP

<?php
interface Loggable
{
    public function log();
}

abstract class Score implements Loggable
{
    private $subject;
    protected $points;

    public function __construct($subject, $points)
    {
        $this->subject = $subject;
        $this->points = $points;
        $this->log();
    }
    public function log()
    {
        echo "Instance created: {$this->subject}" . PHP_EOL;
    }

    abstract protected function getResult();

    public function getInfo()
    {
        return "{$this->subject}, {$this->points}, {$this->getResult()}";
    }
}

class MathScore extends Score
{
    public function __construct($points)
    {
        parent::__construct("Math", $points);
    }

    protected function getResult()
    {
        echo "MathScore method" . PHP_EOL;
        return $this->points >= 50 ? "Pass" : "Fail";
    }
}

class EnglishScore extends Score
{
    public function __construct($points)
    {
        parent::__construct("English", $points);
    }

    protected function getResult()
    {
        echo "EnglishScore method" . PHP_EOL;
        return $this->points >= 95 ? "Pass" : "Fail";
    }
}

class User implements Loggable
{
    private $name;
    private $score;

    public function __construct($name, $score)
    {
        $this->name = $name;
        $this->score = $score;
        $this->log();
    }
    public function log()
    {
        echo "Instance created: {$this->name}" . PHP_EOL;
    }
    public function getInfo()
    {
        return "{$this->name}, {$this->score->getInfo()}";
    }
}

$user1 = new User("Taro", new MathScore(70));
$user2 = new User("Jiro", new EnglishScore(90));

echo $user1->getInfo() . PHP_EOL;
echo $user2->getInfo() . PHP_EOL;

<?php
class User
{
    public $name;
    public $score;
    private static $count = 0;

    public function __construct($name, $score)
    {
        $this->name = $name;
        $this->score = $score;
        User::$count++;
    }

    public static function getUserCount()
    {
        return User::$count;
    }
}

$user1 = new User("Taro", 70);
$user2 = new User("Jiro", 90);

//User::$count++;
//echo User::$count . PHP_EOL;
echo User::getUserCount() . PHP_EOL;

<?php
class User
{
    public $name;
    public $score;
    public static $count = 0;

    public function __construct($name, $score)
    {
        $this->name = $name;
        $this->score = $score;
        User::$count++;
    }
}

// $count = 0;
$user1 = new User("Taro", 70);
// $count++;
$user2 = new User("Jiro", 90);
// $count++;

// echo $count . PHP_EOL;
echo User::$count . PHP_EOL;

<?php
// $addFive = function($n)
// {
//     return $n + 5;
// };
// $addFive = fn($n) => $n + 5;

$scores = [70, 90, 80];
// $updatedScores = array_map($addFive, $scores);
$updatedScores = array_map(fn($n) => $n + 5, $scores);
print_r($updatedScores);