[英]PHP - pass variable between child and parent class
我想知道在父類和子類之間傳遞變量並在整個類中執行更新該類的最佳方法是什么。 例如,我有一個父類,其中執行的是子類:
class My_Class {
public $data;
public $data2;
public function __construct() {
}
public function output() {
$data['key1'] = 1;
$data['key2'] = 2;
$data2['key1'] = 'a';
$data2['key2'] = 'b';
$child_class = new Child_Class();
$child_class->output();
print_r($this->data); // only contains key1 & key2, I want to get key3 and 4 also
print_r($this->data2);
}
}
class Child_Class extends My_Class {
public function __construct() {
}
public function output() {
$data = parent::$data; // want to get data array but it's empty
$data2 = parent::$data2; // want to get data2 array but it's empty
this->set_data();
}
public function set_data() {
$this->data['key3'] = 3;
$this->data['key4'] = 4;
$this->data['key3'] = 'c';
$this->data['key4'] = 'd';
}
}
$class = new My_class();
$class->output();
當前,我需要在父類中執行子類,因為我需要填充父類的主數據。 此類將基於某個變量執行子類。
從父代到子代以及從子代到父代繼承和分配變量的正確方法是什么? 如果我使用依賴注入來獲取擴展類中的數據,如何將變量分配給父類?
“您有例子嗎?”-您來這里...
<?php
class My_Class {
public $data = array('key1'=>1, 'key2'=>2);
public $data2 = array('key1'=>'a', 'key2'=>'b');
public function output() {
echo "MyClass::output\r\n";
print_r($this->data);
print_r($this->data2);
}
}
class Child_Class extends My_Class {
public function __construct() {
$this->data['key3'] = 3;
$this->data['key4'] = 4;
$this->data2['key3'] = 'c';
$this->data2['key4'] = 'd';
}
public function output() {
echo "Child_Class::output\r\n";
parent::output();
}
}
$class = new Child_Class();
$class->output();
版畫
Child_Class::output
MyClass::output
Array
(
[key1] => 1
[key2] => 2
[key3] => 3
[key4] => 4
)
Array
(
[key1] => a
[key2] => b
[key3] => c
[key4] => d
)
也可以看看:
我的問題是類型,而不是我寫$this->data
的$this->data
$this->$data
,只需要在每個語句的開始使用$符號。
我的第二個問題是在訪問父類上的變量時忽略了$this->
部分,因此為父類創建了本地范圍的變量,該子類不與子類共享,應該使用$this->variable
。
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