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php - A value is obviously assigned to variable A, but it is assigned to variable B. Why?
学习ing
学习ing 2017-06-17 09:15:14
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code show as below:

<?php
namespace Controller\Ip;
 
 class IpController{
     public $ip;
     public $key;
     public function Run(){
         $this->$ip = '111';
         $this->$key = '222';
         echo $this->$ip; //输出：222
     }

Why is the final output $this->$key? Looking for a solution, and I hope you can explain it, thank you very much

学习ing
学习ing

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淡淡烟草味
淡淡烟草味2017-06-17 09:17:14 1 floor 
<?php
namespace Controller\Ip;
 
 class IpController{
     public $ip;
     public $key;
     public function Run(){
         $this->ip = '111';
         $this->key = '222';
         echo $this->ip;
     }
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