PHP - 爲類中的變量添加一個值

Question

我正在嘗試使用函數向類中的公共變量添加值。我不確定如何去做。我目前的PHP代碼如下：

class Truck { 
public $Odometer = 0; 
public $Model = 'Triton'; 
public $Price; 
public $Horsepower; 

public function __construct() { 
    $this->Price = 30; 
} 
public function __construct() { 
    $this->Horsepower = 205; 
} 
public function ShowOdometer() { 
    echo "Odometer: ".$this->Odometer; 
} 
public function ShowModel() { 
    echo "Model: ".$this->Model; 
} 
public function ShowPrice() { 
    echo "Cost: ".$this->Price; 
} 
public function ShowHorsepower() { 
    echo "Horsepower: ".$this->Horsepower 
} 
} 

正嘗試通過方法爲$ Price和$ Horsepower添加一個整數值。我試圖使用__construct（），雖然這給了我一個致命錯誤：Cannot redeclare Truck::__construct().

Answer 1

您所定義的class內的兩個constructor，從而錯誤 - Fatal error: Cannot redeclare Truck::__construct()。嘗試 -

class Truck { 
public $Odometer = 0; 
public $Model = 'Triton'; 
public $Price; 
public $Horsepower; 

public function __construct() { 
    $this->Price = 30; 
    $this->Horsepower = 205; 
} 
public function ShowOdometer() { 
    echo "Odometer: ".$this->Odometer; 
} 
public function ShowModel() { 
    echo "Model: ".$this->Model; 
} 
public function ShowPrice() { 
    echo "Cost: ".$this->Price; 
} 
public function ShowHorsepower() { 
    echo "Horsepower: ".$this->Horsepower 
} 
}