在PHP中將數值推入陣列

Question

我無法接收我推入卡陣列的值。我不知道是否我沒有調用正確的屬性，或者我只是沒有正確添加到數組中。

<?php 

class Deck{ 

    public function __construct(){ 
     $values =array('2','3','4','5','6','7','8','9','10','J','Q','K','A'); 
     $suits =array('Diamond','Club','Heart','Spade'); 
     $cards = array(); 
     foreach ($suits as $suit) { 
      foreach($values as $value){ 
       $cards[] = "$value of $suit's"; 
      } 
     } 
    } 
} 

$deck = new Deck(); 
var_dump($deck); 

Answer 1

$cards是一個局部變量__construct：一旦函數結束時，該變量蒸發。相反，你可能想使cards類的成員：

class Deck { 
    public $cards = []; 

    public function __construct() { 
     $values =array('2','3','4','5','6','7','8','9','10','J','Q','K','A'); 
     $suits =array('Diamond','Club','Heart','Spade'); 
     $cards = array(); 
     foreach ($suits as $suit) { 
      foreach($values as $value){ 
       $this->cards[] = "$value of $suit's"; 
      } 
     } 
    } 
} 

然後你可以使用$this->cards物體內部，或$deck->cards之外。