【PHP】オーバーロード - PHPは可変長引数リストで類似実装する

<?php

___ih_hl_start
function addition( ...$numbers ) {
    $total = 0;
    
    foreach( $numbers as $number ) {
        $total += $number;
    }
    
    return $total;
}
___ih_hl_end

___ih_hl_start
$result1 = addition(1,2,3);
___ih_hl_end
echo $result1 . "\n";

___ih_hl_start
$result2 = addition(11,22,33,44,55,66,77,88);
___ih_hl_end
echo $result2 . "\n";

___ih_hl_start
$result3 = addition(99);
___ih_hl_end
echo $result3 . "\n";

?>

$ php sample.php
6
396
99

<?php

// 人間クラス
class Person {
    
    // 名前
    public $name;
    
    // あいさつ
    ___ih_hl_start
    public function greeting( ...$meta ) {
        
        if( isset($meta[0]) ) {
            if( 6 <= $meta[0] && $meta[0] < 11 ) {
                echo "Good morning!\n";
            } else if( 11 <= $meta[0] && $meta[0] < 16 ) {
                echo "Good afternoon!\n";
            } else {
                echo "Good evening!\n";
            }
        }
        
        if( isset($meta[1]) ) {
            echo "The weather is " . $meta[1] . " today.\n";
        }
        
        echo "My name is ". $this->name . ".\n";
    }
    ___ih_hl_end
    
}

$person = new Person();
$person->name = 'TANAKA';


___ih_hl_start
$person->greeting();
___ih_hl_end
echo "-------------------------\n";
___ih_hl_start
$person->greeting(12);
___ih_hl_end
echo "-------------------------\n";
___ih_hl_start
$person->greeting(12, 'sunny');
___ih_hl_end

?>

$ php sample.php
My name is TANAKA.
-------------------------
Good afternoon!
My name is TANAKA.
-------------------------
Good afternoon!
The weather is sunny today.
My name is TANAKA.