我该如何让一个PHP类在其构造函数中实例化另一个类？

Z时代
2024-01-10
分类：问答

我很新，在这里和PHP。我该如何让一个PHP类在其构造函数中实例化另一个类？

我想知道在他的参数中在另一个类构造函数中实例化类的正确方法。

（我在钮一些狗屎测试）

class CryptoControl { 
    public $helper; 
    public $keyValues; 
    public function __construct ($primo1, $primo2, $message) { 
     $this->helper = new MathHelper(); 
     $this->keyValues = new KeyValues($primo1, $primo2, $message); 
    } 
    public function criptografa_descriptografa_simetrica() { 
     $message = $keyValues->getMessage(); 
     echo "Texto original: " . $message . "\n"; 
     echo "Chave criptografada: " . base64_encode($message) . "\n"; 
     $message_criptografada = base64_encode($message); 
     echo "Chave descriptografada: " . base64_decode($message_criptografada) . "\n"; 
    } 
} 
$exec = new CryptoControl(17, 41, "TURING"); 
$resposta = $exec->criptografa_descriptografa_simetrica(); 
echo $resposta;

而这是我想将类实例：

class KeyValues { 
    public $numeroPrimo_1; 
    public $numeroPrimo_2; 
    public $message; 
    public function KeyValues ($primo1, $primo2, $message) { 
     $this->numeroPrimo_1 = $primo1; 
     $this->numeroPrimo_2 = $primo2; 
     $this->message = $message; 
    } 
    #getters and setters 
}

这是我得到的错误..

PHP注意：未定义的变量：keyValues在/home/rodolfolottin/gitrepositories/Crypto/CryptoControl.php上线72 PHP致命错误：调用成员函数getM essage（）非对象/home/rodolfolottin/gitrepositories/Crypto/CryptoControl.php在线72

感谢您的帮助......

回答：

更改以下行

$message = $keyValues->getMessage();

到

$message = $this->keyValues->getMessage();

$keyValues在一个类里面的方法引用一个局部变量。当您使用$this关键字进行访问时，它将引用该类的对象的属性。

回答：

class KeyValues { 
    public $numeroPrimo_1; 
    public $numeroPrimo_2; 
    public $message; 
    public function KeyValues ($primo1, $primo2, $message) { 
     $this->numeroPrimo_1 = $primo1; 
     $this->numeroPrimo_2 = $primo2; 
     $this->message = $message; 
    } 
    public function getMessage() { 
     return $this->message; 
    } 
    #getters and setters 
} 
class CryptoControl { 
    public $helper; 
    public $keyValues; 
    public function __construct ($primo1, $primo2, $message) { 
     $this->helper = new MathHelper(); 
     $this->keyValues = new KeyValues($primo1, $primo2, $message); 
    } 
    public function criptografa_descriptografa_simetrica() { 
     $message = $this->keyValues->getMessage(); 
     echo "Texto original: " . $message . "\n"; 
     echo "Chave criptografada: " . base64_encode($message) . "\n"; 
     $message_criptografada = base64_encode($message); 
     echo "Chave descriptografada: " . base64_decode($message_criptografada) . "\n"; 
    } 
} 
$exec = new CryptoControl(17, 41, "TURING"); 
$resposta = $exec->criptografa_descriptografa_simetrica(); 
echo $resposta;