在PHP中重写父类的构造函数

[英]Override parent's parent's constructor in PHP


I have one PHP class thus:

我有一个PHP类:

class DB extends mysqli{
    public function __construct(
      {
       parent::__construct('localhost','user','password','db');
      }
}

My problem is that I want to override this class with a new one that performs more privileged database operations with a different db user.

我的问题是,我想用一个新的类来覆盖这个类,这个类可以对不同的db用户执行更多的特权数据库操作。

class adminDB extends DB{
    public function __construct(
      {
       ??
      }
    }
}

What should I do here?

我该怎么做呢?

2 个解决方案

#1


7  

You should pass the credentials to the constructor anyway:

无论如何,您应该将凭证传递给构造函数:

class DB extends mysqli {
    public function __construct($host, $user, $password, $db)
    {
        parent::__construct($host, $user, $password, $db);
    }
}

Then you don't need inheritance you can just use:

那么你就不需要继承了,你只需要:

$adminDb = new DB($adminHost, $adminUser, $adminPassword, $db);
$nonAdminDb = new DB($host, $user, $password, $db);

But if you really want inheritance you could still do this:

但是如果你真的想要继承你仍然可以这样做:

class AdminDB extends DB {
    public function __construct() {
        parent::__construct('adminhost','adminuser','adminpassword','db');
    }
}

#2


-1  

<?php
    class mohona{
        public $name;
        public $age;
        public $fname;
        public $lname;
        public function __construct($cname,$cage,$cfname,$clname){
            $this->name=$cname;
            $this->age=$cage;
            $this->fname=$cfname;
            $this->lname=$clname;


        }
        public function getMohona(){
            echo "Full Name: ".$this->fname." ".$this->lname." ".$this->name."<br/>Age: ".$this->age."<br/>";
        }
    }
    class ibrahim extends mohona{
        public $relational_status;
        public $relation;
        public $contact;
        public function __construct($cname,$cage,$cfname,$clname,$crelational_status,$crelation,$ccontact){
            parent::__construct($cname,$cage,$cfname,$clname);
            $this->relational_status=$crelational_status;
            $this->relation=$crelation;
            $this->contact=$ccontact;
        }
        public function getIbrahim(){
            echo "Full Name: ".$this->fname." ".$this->lname." ".$this->name."<br/>Age: ".$this->age."<br/>"."Relational Status: ".$this->relational_status."<br/>Maritual Status: ".$this->relation."<br/>Contact Status: ".$this->contact;
        }
    }
    $oMohona=new mohona("Mohona","20","Nafis","Anjum");
    $oIbrahim=new ibrahim("Ibu","25","Ibrahim","Akbar","Single","Unmarried","blocked");
    echo $oMohona->getMohona();
    echo $oIbrahim->getIbrahim();
?>
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