php - $this->$propertyName = $value,$this->propertyName = $value的区别?
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问题描述
问 题
在通过__set($propertyName,$value)设置private成员属性时,
用$this->$propertyName = $value的写法才可以进行private变量值的修改,
采用$this->propertyName = $value的写法则不能进行变量值的修改。
完整代码:
class BasePerson{
private $name;
private $age;
private $average;
function __construct(){
$num_args = func_num_args();
if($num_args == 1){
$this->name = func_get_arg(0);
} elseif($num_args == 2){
$this->name = func_get_arg(0);
$this->age = func_get_arg(1);
} elseif($num_args == 3){
$this->name = func_get_arg(0);
$this->age = func_get_arg(1);
$this->average = func_get_arg(2);
}
}
private function __set($propertyName,$propertyValue){
echo "</br>BasePerson __set()";
if($propertyName == "name"){
if($propertyValue == "zhangsan" || $propertyValue == "wangwu"){
$this->$propertyName = $propertyValue;
}
} elseif($propertyName=="age"){
if($propertyValue >150 || $propertyValue <0){
return ;
}
}
$this->$propertyName = $propertyValue;
}
function __toString(){
return "</br>name:".($this->name)."</br>age:".($this->age)."</br>average".($this->average);
}
}
解决方案
$name = 'test';
$$name = '123';
var_dump($test); //输出123
//希望你能理解
//同理
$this->$proertyName //需要看$proertyName的值, 是设置$proertyName的值这个属性
$proertyName = 'age';
$this->$proertyName = '12';
var_dump($this->age); //输出12
$this->proertyName //设置的是proertyName这个属性
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