[PHP] extended class question

[Ed Lazor]

How come the output to this script is World Trade Center instead of Pizza
Delivery?

Thanks,

Ed



?php

class test {
private $var1;

function __construct() {
$this-var1 = World Trade Center;
}

function get_var1() {
return $this-var1;
}

function set_var1($data) {
$this-var1 = $data;
}
}

class testing extends test {
function __construct() {
parent::__construct();
$this-var1 = Pizza Delivery;
}
}


$test2 = new testing();
print var1 =  . $test2-get_var1() . br;

?

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Re: [PHP] extended class question

[Curt Zirzow]

* Thus wrote Ed Lazor:
 How come the output to this script is World Trade Center instead of Pizza
 Delivery?
 
 Thanks,
 
 Ed
 
 
 
 ?php
 
 class test {
   private $var1;

defines 'test' class to only have access.

   
   function __construct() {
   $this-var1 = World Trade Center;
   }
   
   function get_var1() {
   return $this-var1;

accesses the private $var1

   }
   
   function set_var1($data) {
   $this-var1 = $data;
   }
 }
 
 class testing extends test {
   function __construct() {
   parent::__construct();
   $this-var1 = Pizza Delivery;

This creates a publicly accessable member for the *testing* class.

   }
 }
 
 
 $test2 = new testing();
 print var1 =  . $test2-get_var1() . br;

If you wish for it to change within testing class, declare the
member as a protected var in the test class.

class test {
  protected $var1; /* allows access to extending classes */
}

See also:
 http://php.net/oop5.visibility


Curt
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Re: [PHP] extended class question

[Rick Fletcher]

Ed Lazor wrote:
How come the output to this script is World Trade Center instead of Pizza
Delivery?
Thanks,
Ed

?php
class test {
private $var1;

function __construct() {
$this-var1 = World Trade Center;
}

function get_var1() {
return $this-var1;
}

function set_var1($data) {
$this-var1 = $data;
}
}
class testing extends test {
function __construct() {
parent::__construct();
$this-var1 = Pizza Delivery;
}
}
$test2 = new testing();
print var1 =  . $test2-get_var1() . br;
?
Because test's var1 is private.
test-var1 isn't accessible by class testing, so the assignment you're 
doing in testing's constructor is assigning Pizza Delivery to 
testing-var1 instead.

When you call $test2-get_var1() you're calling the parent's get_var1() 
method, which prints out the parent's var1 property. (which hasn't been 
touched.)

Change test's var1 to protected and it'll work.
--rick
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RE: [PHP] extended class question

[Ed Lazor]

 Because test's var1 is private.
 
 test-var1 isn't accessible by class testing, so the assignment you're
 doing in testing's constructor is assigning Pizza Delivery to
 testing-var1 instead.
 
 When you call $test2-get_var1() you're calling the parent's get_var1()
 method, which prints out the parent's var1 property. (which hasn't been
 touched.)
 
 Change test's var1 to protected and it'll work.
 

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