[英]Access public properties parent class from an extended public function class
我是PHP的新手,這是我的代碼
class number_config{
public $length = 200, //declare a properties
$width = 100,
$height = 300;
}
class formula extends number_config{
public function rectangular_prism(){
$volume = $length * $width * $height;
echo 'The rectangular prism volume is: '. $volume .'meter cubic';
// i want this echo produce this,
// The rectangular prism volume is: 6000000 meter cubic
//set the new member_config properties value
$length = 600;
$width = 1000;
$height = 400;
}
public function rectangular_prism2(){
$volume = $length * $width * $height;
echo 'The rectangular prism volume is: '. $volume .'meter cubic';
// i want this echo produce this,
// The rectangular prism volume is: 240000000 meter cubic
//and then set the other new member_config properties value, and so on
$length = 800;
$width = 2000;
$height = 300;
}
}
$rectangular_prism_volume = new formula();
echo $rectangular_prism_volume->rectangular_prism();
echo $rectangular_prism_volume->rectangular_prism2();
首先,對不起這個愚蠢的php代碼,
我是新手,請嘗試練習:)
該代碼無效,
打印出錯誤
注意 :未定義的變量:第11行的xxx.php中的寬度
注意 :未定義變量:第11行上xxx.php中的長度
注意 :未定義的變量:第11行的xxx.php中的高度
直角棱鏡體積為:0米立方
注意 :未定義的變量:第23行上xxx.php中的寬度
注意 :未定義的變量:第23行上xxx.php中的長度
注意 :未定義的變量:第23行上xxx.php中的高度
直角棱鏡體積為:0米立方
我想問的是如何獲取該父類的屬性
在一個函數上,並分配一個新的屬性值來覆蓋寬度,長度,高度,屬性值
感謝您為我提供幫助的人:)
這是您嘗試做的更好的方法,使用set和get方法在需要時設置成員值,然后獲取它。
class number_config{
public $length = 200; //declare a properties
public $width = 100;
public $height = 300;
public function setLength($l){
$this->length = $l;
}
public function setWidth($w){
$this->width = $w;
}
public function setHeight($h){
$this->height = $h;
}
public function getLength(){
return $this->length ;
}
public function getWidth(){
return $this->width ;
}
public function getHeight(){
return $this->height ;
}
}
class formula extends number_config{
public function rectangular_prism(){
$volume = $this->getLength() * $this->getWidth() * $this->getHeight();
echo 'The rectangular prism volume is: '. $volume .'meter cubic';
}
public function rectangular_prism2(){
$volume = $this->getLength() * $this->getWidth() * $this->getHeight();
echo 'The rectangular prism volume is: '. $volume .'meter cubic';
}
}
$formula = new formula();
//call the function rectangular_prism() with some values
$formula->setLength(600);
$formula->setWidth(1000);
$formula->setHeight(400);
$formula->rectangular_prism();
//call the function rectangular_prism2() with some values
$formula->setLength(800);
$formula->setWidth(2000);
$formula->setHeight(300);
$formula->rectangular_prism2();
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