florante_navaja

It is said that the constructor must be declared public.
for whatever reason, it can be declared protected or private!
However, only child classes can make a call to the protected or private parent constructor.
Instantiating the parent class will produce an error.
In the same manner, a protected __destruct in the parent class is possible, but *must not* be private.

Here's the snippet:

<?php
class Visibility
{
public function pubFunc() {
echo 'pubFunc called';
}
protected function protFunc() {
echo 'protFunc called ';
}
private function privFunc() {
echo 'privFunc called';
}
function privAccessor() {
privFunc();
}

/*alternate these next two lines */

//private function __construct() {
protected function __construct() {
echo 'Visibility constructor called';
}

// private function __destruct() //fails!
protected function __destruct() { //ok!
echo 'Visibility destructor called';
}
}

class ChildVisibility extends Visibility
{
public function callProtFunc() {
parent:rotFunc();
}

public function __construct() {
parent::__construct();
echo 'ChildVisibility constructor called';
}

public function __destruct() {
echo 'ChildVisibility destructor called';
parent::__destruct();
}
}

$oCV = new ChildVisibility();
$oCV->callProtFunc();

?>
Here's what i got:

Visibility constructor called
ChildVisibility constructor called
protFunc called
ChildVisibility destructor called
Visibility destructor called
----
Server IP: 66.163.161.117
Probable Submitter: 218.219.13.70 (proxied: unknown)
----
Manual Page -- http://www.php.net/manual/en/language.oop5.visibility.php
Edit -- https://master.php.net/note/edit/70362
Del: integrated -- https://master.php.net/note/delete/70362/integrated
Del: useless -- https://master.php.net/note/delete/70362/useless
Del: bad code -- https://master.php.net/note/delete/70362/bad+code
Del: spam -- https://master.php.net/note/delete/70362/spam
Del: non-english -- https://master.php.net/note/delete/70362/non-english
Del: in docs -- https://master.php.net/note/delete/70362/in+docs
Del: other reasons-- https://master.php.net/note/delete/70362
Reject -- https://master.php.net/note/reject/70362
Search -- https://master.php.net/manage/user-notes.php

bobby

Note Submitter: florante_navaja at yahoo dot com

----

It is said that the constructor must be declared public.
for whatever reason, it can be declared protected or private!
However, only child classes can make a call to the protected or private parent constructor.
Instantiating the parent class will produce an error.
In the same manner, a protected __destruct in the parent class is possible, but *must not* be private.

Here's the snippet:

<?php
class Visibility
{
public function pubFunc() {
echo 'pubFunc called';
}
protected function protFunc() {
echo 'protFunc called ';
}
private function privFunc() {
echo 'privFunc called';
}
function privAccessor() {
privFunc();
}

/*alternate these next two lines */

//private function __construct() {
protected function __construct() {
echo 'Visibility constructor called';
}

// private function __destruct() //fails!
protected function __destruct() { //ok!
echo 'Visibility destructor called';
}
}

class ChildVisibility extends Visibility
{
public function callProtFunc() {
parent:rotFunc();
}

public function __construct() {
parent::__construct();
echo 'ChildVisibility constructor called';
}

public function __destruct() {
echo 'ChildVisibility destructor called';
parent::__destruct();
}
}

$oCV = new ChildVisibility();
$oCV->callProtFunc();

?>
Here's what i got:

Visibility constructor called
ChildVisibility constructor called
protFunc called
ChildVisibility destructor called
Visibility destructor called