PHP入門 オブジェクト指向 クラス定義

class クラス名{
  ・・・プロパティ/メソッドの定義
}

<?php
class Person{
    }

<?php
require_once 'Person.php';
$p = new Person();

<?php
class Person{
  public string $firstName;
  public string $lastName;
}

public string $firstName = "山田";

<?php
class Person{
    public string $firstName;
    public string $lastName;
    }

<?php
require_once 'Person.php';
$p1 = new Person();
$p1 -> lastName = '山田';
$p1 -> firstName = '太郎';

$p2 = new Person();
$p2 -> lastName = '山田';
$p2 -> firstName = '花子';

print "<p>私の名前は{$p1->lastName}{$p1->firstName}です</p>";
print "<p>私の名前は{$p2->lastName}{$p2->firstName}です</p>";

<?php
require_once 'Person.php';
$p1 = new Person();
$p1->lastName = '山田';
$p1->firstName = '太郎';
$p1->age = 52;

print $p1->age;

<?php
class Person{
    public string $firstName;
    public string $lastName;
    public function show():void{
        print "<p>私の名前は{$this->lastName}{$this->firstName}です</p>";
    }
    }

<?php
require_once 'Person.php';
$p1 = new Person();
$p1 -> lastName = '山田';
$p1 -> firstName = '太郎';
$p1->show();

<?php

class Person{
    public string $firstName;
    public string $lastName;
    //追加のメソッド群を格納する配列
    private array $methods = [];

    //指定のメソッドを登録
    public function __set(string $name, Closure $method): void{
        $this->methods[$name] = $method->bindTo($this, self::class);//➋
    }
    //動的に登録されたメソッドを実行
    public function __call(string $name, array $args): mixed{
        //methodsプロパティに未登録のメソッドはエラー
        if(!array_key_exists($name, $this->methods)){
            throw new Exception("${name} method is not existed.");
        }
        return $this->methods[$name](...$args);
    }
}

$p1 = new Person();
$p1->lastName = '山田';
$p1->firstName = '太郎';
$p1->bye = function(): void{               //➊
    print "{$this->lastName}{$this->firstName}さん、さよなら";
};
$p1->bye();

Closure::bindTo(object $newthis[, mixed $newscope = "static"]):Closure|null

__construct([mixed ...$values])

<?php
class Person{
    public string $firstName;
    public string $lastName;

    public function __construct(string $firstName, string $lastName){
        $this->firstName = $firstName;
        $this->lastName = $lastName;
    }

    public function show():void{
        print "<p>私の名前は{$this->lastName}{$this->firstName}です</p>";
    }
    }

<?php
require_once 'Person.php';
$p1 = new Person('太郎','山田');
$p->show();

<?php
class Person{
    public function __construct(
        public string $firstName,
        public string $lastName
    ){

    }
}

<?php
class Person{
    public function __construct(
        public string $firstName='太郎',
        public string $lastName='山田'
    ){

    }
}

<?php
class Person{
    public function __destruct(){
        print '<p>'.__CLASS__.'オブジェクトが破棄されました。</p>';
    }

    }

<?php
require_once 'Person.php';
$p1 = new Person('太郎','山田');
$p1->show();

<?php
class Area {
    public static function circle(float $radius): float{
        return pow($radius, 2) * 3.14;
    }
}

<?php
require_once 'Area.php';
print '円の面積：'.Area::circle(10).'cm^2';

<?php
class Area {
    public static float $pi = 3.14;
    public static function circle(float $radius): float{
        return pow($radius, 2) * self::$pi;
    }
}

<?php
require_once 'Area.php';
print '円周率：'.Area::$pi.'<br />';
print '円の面積：'.Area::circle(10).'cm^2';

<?php
class MySinglete{
    private static self $instance;
    private function __construct(){}

    //インスタンスの有無をチェックし、存在しない場合にだけインスタンス化
    public static function getInstance(): self{
        if(!isset(self::$instance)){
            self::$instance = new MySinglete();
        }
        return self::$instance;
    }
}

$c1 = MySinglete::getInstance();
$c2 = MySinglete::getInstance();
var_dump($c1 === $c2);

<?php
class Area {
    public const PI = 3.14;
    public static function circle(float $radius): float{
        return pow($radius, 2) * self::PI;
    }
}

<?php
require_once 'Area.php';
print '円周率：'.Area::PI.'<br />';
print '円の面積：'.Area::circle(10).'cm^2';