how to call a variable from one class function to another class function

Question

i am new to php oop

I have an two files Here is my code

1)info.php

public $bd, $db1;    
class Connection {  
  function connect() {  
    $this->db = 'hello world';  
    $this->db1 = 'hi'  
  }  
}

2) prd.php

require_once 'info.php'
class prdinfo {  
  function productId() {  
    echo Connection::connect()->$bd;  
    echo Connection::connect()->$db1;   
  }  
$prd = new prdinfo ();  
$prd->productId ();

how i can echo my var in 2nd class i have tried in that way but i am not getting proper output

Thanks

None of those two classes are valid class declarations in the first place — Hanky Panky
– Hanky Panky, Commented Oct 7, 2013 at 5:58
First step you need to declare public variable inside class. Then use extends to extend the first class in second class to access base class variables — Nes
– Nes, Commented Oct 7, 2013 at 6:01
You should learn oop first cause you don't know what is it and what is it for so we can't help you. — Sina R.
– Sina R., Commented Oct 7, 2013 at 6:01

web-nomad · Accepted Answer · 2013-10-09 05:51:46Z

3

It should be something like this.

info.php

class Connection {
   // these two variable should be declared within the class.
   protected $db; // to be able to access these variables from a diff class
   protected $db1; // either their scope should be "protected" or define a getter method.

   public function __construct() {
      $this->connect();
   }

   private function connect() {
       $this->db = 'hello world';
       $this->db1 = 'hi';
   }
}

prd.php

require_once 'info.php';

// you are accessing the Connection class in static scope
// which is not the case here.
class prdinfo extends Connection {
   public function __construct() {
       // initialize the parent class
       // which in turn sets the variables.
       parent::__construct();
   }

   public function productId() {
        echo $this->db;
        echo $this->db1;
   }
}


$prd = new prdinfo ();
$prd->productId ();

This is a basic demonstration. Modify it as per your needs. More here - http://www.php.net/manual/en/language.oop5.php

edited Oct 9, 2013 at 5:51

answered Oct 7, 2013 at 6:03

web-nomad

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3 Comments

Hanky Panky Over a year ago

Might help mentioning the mistakes that they had, a number of them

Amal Over a year ago

And echo $this->$db; should be echo $this->db;

web-nomad Over a year ago

Good catch, @AmalMurali. Rectified.

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