When and why should I use public, private, and protected functions and variables inside a class? What is the difference between them?
Examples:
// Public
public $variable;
public function doSomething() {
// ...
}
// Private
private $variable;
private function doSomething() {
// ...
}
// Protected
protected $variable;
protected function doSomething() {
// ...
}
You use:
public scope to make that property/method available from anywhere, other classes and instances of the object.
private scope when you want your property/method to be visible in its own class only.
protected scope when you want to make your property/method visible in all classes that extend current class including the parent class.
If you don't use any visibility modifier, the property / method will be public.
More: (For comprehensive information)
PHP Manual - Visibility
Public:
When you declare a method (function) or a property (variable) as public, those methods and properties can be accessed by:
The same class that declared it.
The classes that inherit the above declared class.
Any foreign elements outside this class can also access those things.
Example:
<?php
class GrandPa
{
public $name='Mark Henry'; // A public variable
}
class Daddy extends GrandPa // Inherited class
{
function displayGrandPaName()
{
return $this->name; // The public variable will be available to the inherited class
}
}
// Inherited class Daddy wants to know Grandpas Name
$daddy = new Daddy;
echo $daddy->displayGrandPaName(); // Prints 'Mark Henry'
// Public variables can also be accessed outside of the class!
$outsiderWantstoKnowGrandpasName = new GrandPa;
echo $outsiderWantstoKnowGrandpasName->name; // Prints 'Mark Henry'
Protected:
When you declare a method (function) or a property (variable) as protected, those methods and properties can be accessed by
The same class that declared it.
The classes that inherit the above declared class.
Outsider members cannot access those variables. "Outsiders" in the sense that they are not object instances of the declared class itself.
Example:
<?php
class GrandPa
{
protected $name = 'Mark Henry';
}
class Daddy extends GrandPa
{
function displayGrandPaName()
{
return $this->name;
}
}
$daddy = new Daddy;
echo $daddy->displayGrandPaName(); // Prints 'Mark Henry'
$outsiderWantstoKnowGrandpasName = new GrandPa;
echo $outsiderWantstoKnowGrandpasName->name; // Results in a Fatal Error
The exact error will be this:
PHP Fatal error: Cannot access protected property GrandPa::$name
Private:
When you declare a method (function) or a property (variable) as private, those methods and properties can be accessed by:
The same class that declared it.
Outsider members cannot access those variables. Outsiders in the sense that they are not object instances of the declared class itself and even the classes that inherit the declared class.
Example:
<?php
class GrandPa
{
private $name = 'Mark Henry';
}
class Daddy extends GrandPa
{
function displayGrandPaName()
{
return $this->name;
}
}
$daddy = new Daddy;
echo $daddy->displayGrandPaName(); // Results in a Notice
$outsiderWantstoKnowGrandpasName = new GrandPa;
echo $outsiderWantstoKnowGrandpasName->name; // Results in a Fatal Error
The exact error messages will be:
Notice: Undefined property: Daddy::$name
Fatal error: Cannot access private property GrandPa::$name
Dissecting the Grandpa Class using Reflection
This subject is not really out of scope, and I'm adding it here just to prove that reflection is really powerful. As I had stated in the above three examples, protected and private members (properties and methods) cannot be accessed outside of the class.
However, with reflection you can do the extra-ordinary by even accessing protected and private members outside of the class!
Well, what is reflection?
Reflection adds the ability to reverse-engineer classes, interfaces,
functions, methods and extensions. Additionally, they offers ways to
retrieve doc comments for functions, classes and methods.
Preamble
We have a class named Grandpas and say we have three properties. For easy understanding, consider there are three grandpas with names:
Mark Henry
John Clash
Will Jones
Let us make them (assign modifiers) public, protected and private respectively. You know very well that protected and private members cannot be accessed outside the class. Now let's contradict the statement using reflection.
The code
<?php
class GrandPas // The Grandfather's class
{
public $name1 = 'Mark Henry'; // This grandpa is mapped to a public modifier
protected $name2 = 'John Clash'; // This grandpa is mapped to a protected modifier
private $name3 = 'Will Jones'; // This grandpa is mapped to a private modifier
}
# Scenario 1: without reflection
$granpaWithoutReflection = new GrandPas;
# Normal looping to print all the members of this class
echo "#Scenario 1: Without reflection<br>";
echo "Printing members the usual way.. (without reflection)<br>";
foreach($granpaWithoutReflection as $k=>$v)
{
echo "The name of grandpa is $v and he resides in the variable $k<br>";
}
echo "<br>";
#Scenario 2: Using reflection
$granpa = new ReflectionClass('GrandPas'); // Pass the Grandpas class as the input for the Reflection class
$granpaNames=$granpa->getDefaultProperties(); // Gets all the properties of the Grandpas class (Even though it is a protected or private)
echo "#Scenario 2: With reflection<br>";
echo "Printing members the 'reflect' way..<br>";
foreach($granpaNames as $k=>$v)
{
echo "The name of grandpa is $v and he resides in the variable $k<br>";
}
Output:
#Scenario 1: Without reflection
Printing members the usual way.. (Without reflection)
The name of grandpa is Mark Henry and he resides in the variable name1
#Scenario 2: With reflection
Printing members the 'reflect' way..
The name of grandpa is Mark Henry and he resides in the variable name1
The name of grandpa is John Clash and he resides in the variable name2
The name of grandpa is Will Jones and he resides in the variable name3
Common Misconceptions:
Please do not confuse with the below example. As you can still see, the private and protected members cannot be accessed outside of the class without using reflection
<?php
class GrandPas // The Grandfather's class
{
public $name1 = 'Mark Henry'; // This grandpa is mapped to a public modifier
protected $name2 = 'John Clash'; // This grandpa is mapped to a protected modifier
private $name3 = 'Will Jones'; // This grandpa is mapped to a private modifier
}
$granpaWithoutReflections = new GrandPas;
print_r($granpaWithoutReflections);
Output:
GrandPas Object
(
[name1] => Mark Henry
[name2:protected] => John Clash
[name3:GrandPas:private] => Will Jones
)
Debugging functions
print_r, var_export and var_dump are debugger functions. They present information about a variable in a human-readable form. These three functions will reveal the protected and private properties of objects with PHP 5. Static class members will not be shown.
More resources:
The PHP Manual - OOP Properties
The PHP Manual - OOP Visibility
Techflirt.com - Visibility in PHP Classes
Jordizle.com - Public, Private, Protected in PHP 5
private - can be accessed from WITHIN the class only
protected - can be accessed from WITHIN the class and INHERITING classes
public - can be accessed from code OUTSIDE the class as well
This applies to functions as well as variables.
It is typically considered good practice to default to the lowest visibility required as this promotes data encapsulation and good interface design. When considering member variable and method visibility think about the role the member plays in the interaction with other objects.
If you "code to an interface rather than implementation" then it's usually pretty straightforward to make visibility decisions. In general, variables should be private or protected unless you have a good reason to expose them. Use public accessors (getters/setters) instead to limit and regulate access to a class's internals.
To use a car as an analogy, things like speed, gear, and direction would be private instance variables. You don't want the driver to directly manipulate things like air/fuel ratio. Instead, you expose a limited number of actions as public methods. The interface to a car might include methods such as accelerate(), deccelerate()/brake(), setGear(), turnLeft(), turnRight(), etc.
The driver doesn't know nor should he care how these actions are implemented by the car's internals, and exposing that functionality could be dangerous to the driver and others on the road. Hence the good practice of designing a public interface and encapsulating the data behind that interface.
This approach also allows you to alter and improve the implementation of the public methods in your class without breaking the interface's contract with client code. For example, you could improve the accelerate() method to be more fuel efficient, yet the usage of that method would remain the same; client code would require no changes but still reap the benefits of your efficiency improvement.
Edit: Since it seems you are still in the midst of learning object oriented concepts (which are much more difficult to master than any language's syntax), I highly recommend picking up a copy of PHP Objects, Patterns, and Practice by Matt Zandstra. This is the book that first taught me how to use OOP effectively, rather than just teaching me the syntax. I had learned the syntax years beforehand, but that was useless without understanding the "why" of OOP.
The difference is as follows:
Public :: A public variable or method can be accessed directly by any user of the class.
Protected :: A protected variable or method cannot be accessed by users of the class but can be accessed inside a subclass that inherits from the class.
Private :: A private variable or method can only be accessed internally from the class in which it is defined.This means that a private variable or method cannot be called from a child that extends the class.
Visibility Scopes with Abstract Examples :: Makes easy Understanding
This visibility of a property or method is defined by pre-fixing declaration of one of three keyword (Public, protected and private)
Public : If a property or method is defined as public, it means it can be both access and manipulated by anything that can refer to object.
Abstract eg. Think public visibility scope as "public picnic" that anybody can come to.
Protected : when a property or method visibility is set to protected members can only be access within the class itself and by inherited & inheriting classes. (Inherited:- a class can have all the properties and methods of another class).
Think as a protected visibility scope as "Company picnic" where company members and their family members are allowed not the public. It's the most common scope restriction.
Private : When a property or method visibility is set to private, only the class that has the private members can access those methods and properties(Internally within the class), despite of whatever class relation there maybe.
with picnic analogy think as a "company picnic where only the company members are allowed" in the picnic. not family neither general public are allowed.
/**
* Define MyClass
*/
class MyClass
{
public $public = 'Public';
protected $protected = 'Protected';
private $private = 'Private';
function printHello()
{
echo $this->public;
echo $this->protected;
echo $this->private;
}
}
$obj = new MyClass();
echo $obj->public; // Works
echo $obj->protected; // Fatal Error
echo $obj->private; // Fatal Error
$obj->printHello(); // Shows Public, Protected and Private
/**
* Define MyClass2
*/
class MyClass2 extends MyClass
{
// We can redeclare the public and protected method, but not private
protected $protected = 'Protected2';
function printHello()
{
echo $this->public;
echo $this->protected;
echo $this->private;
}
}
$obj2 = new MyClass2();
echo $obj2->public; // Works
echo $obj2->private; // Undefined
echo $obj2->protected; // Fatal Error
$obj2->printHello(); // Shows Public, Protected2, Undefined
Extracted From :
http://php.net/manual/en/language.oop5.visibility.php
⚡️ Here is an easy way to remember the scope of public, protected and private.
PUBLIC:
public scope: A public variable/function is available to both objects and other classes.
PROTECTED:
protected scope: A protected variable/function is available to all the classes that extend the current class.
No! Objects cannot access this scope
PRIVATE:
private scope: A private variable/function is only visible in the current class where it is being defined.
No! Class that extend the current class cannot access this scope.
No! Objects cannot access this scope.
Read the Visibility of a method or variable on PHP Manual.
Considering 'when':
I tend to declare everything as private initially, if I'm not exactly sure. Reason being, that it's usually much easier to turn a private method public than the other way round. That's because you can at least be sure that the private method hasn't been used anywhere but in the class itself. A public method may already be in use everywhere, possibly requiring an extensive re-write.
Update: i go for a default of protected nowadays, because I've come to find that it's good enough for encapsulation and doesn't get in the way when I'm extending classes (which i try to avoid anyway). Only if i have a good reason to use the other two, i will.
A good reason for a private method would be one that implements something inherent to that object that even an extending class should not change (factual reason, in addition to encapsulation, like internal state management). Eventually, it's still easy enough to track down where a protected method is being used usually, so i default to protected nowadays. Maybe not 100% objective "in the trenches" experience, I admit.
For me, this is the most useful way to understand the three property types:
Public: Use this when you are OK with this variable being directly accessed and changed from anywhere in your code.
Example usage from outside of the class:
$myObject = new MyObject()
$myObject->publicVar = 'newvalue';
$pubVar = $myObject->publicVar;
Protected: Use this when you want to force other programmers (and yourself) to use getters/setters outside of the class when accessing and setting variables (but you should be consistent and use the getters and setters inside the class as well). This or private tend to be the default way you should set up all class properties.
Why? Because if you decide at some point in the future (maybe even in like 5 minutes) that you want to manipulate the value that is returned for that property or do something with it before getting/setting, you can do that without refactoring everywhere you have used it in your project.
Example usage from outside of the class:
$myObject = new MyObject()
$myObject->setProtectedVar('newvalue');
$protectedVar = $myObject->getProtectedVar();
Private: private properties are very similar to protected properties. But the distinguishing feature/difference is that making it private also makes it inaccessible to child classes without using the parent class's getter or setter.
So basically, if you are using getters and setters for a property (or if it is used only internally by the parent class and it isn't meant to be accessible anywhere else) you might as well make it private, just to prevent anyone from trying to use it directly and introducing bugs.
Example usage inside a child class (that extends MyObject):
$this->setPrivateVar('newvalue');
$privateVar = $this->getPrivateVar();
Reviving an old question, but I think a really good way to think of this is in terms of the API that you are defining.
public - Everything marked public is part of the API that anyone using your class/interface/other will use and rely on.
protected - Don't be fooled, this is also part of the API! People can subclass, extend your code and use anything marked protected.
private - Private properties and methods can be changed as much as you like. No one else can use these. These are the only things you can change without making breaking changes.
Or in Semver terms:
Changes to anything public or protected should be considered MAJOR changes.
Anything new public or protected should be (at least) MINOR
Only new/changes to anything private can be PATCH
So in terms of maintaining code, its good to be careful about what things you make public or protected because these are the things you are promising to your users.
PHP manual has a good read on the question here.
The visibility of a property or method can be defined by prefixing the declaration with the keywords public, protected or private. Class members declared public can be accessed everywhere. Members declared protected can be accessed only within the class itself and by inherited and parent classes. Members declared as private may only be accessed by the class that defines the member.
They're there to allow for different levels of encapsulation
Variables in PHP are cast in three different type:
Public : values of this variable types are available in all scope and call on execution of you code.
declare as: public $examTimeTable;
Private: Values of this type of variable are only available on only to the class it belongs to.
private $classRoomComputers;
Protected: Values of this class only and only available when Access been granted in a form of inheritance or their child class. generally used :: to grant access by parent class
protected $familyWealth;
Public: is a default state when you declare a variable or method, can be accessed by anything directly to the object.
Protected: Can be accessed only within the object and subclasses.
Private: Can be referenced only within the object, not subclasses.
The mentioned keywords are access modifiers and help us implement Encapsulation (or information hiding). They tell the compiler which other classes should have access to the field or method being defined.
private - Only the current class will have access to the field or method.
protected - Only the current class and subclasses (and sometimes also same-package classes) of this class will have access to the field or method.
public - Any class can refer to the field or call the method.
I have an abstract class which defines several constants. Most of these constants will not be overridden by any child classes, but one should be.
I define this one constant as null in my abstract class, and in the child class I assign it a value. The constructor will be the same in all child classes as well, so I have added a check to see if the constant was assigned a value or not, and throw an exception if it was not defined by the child class.
Some simplified code to sketch my problem:
Parent abstract class:
abstract class ParentClass {
const TEST_CONSTANT = null;
public function __construct()
{
if (!defined(self::TEST_CONSTANT)) {
throw new Exception("Please define TEST_CONSTANT!");
}
}
abstract protected function someFunction();
}
Child class:
class ChildClass extends ParentClass {
const TEST_CONSTANT = "value";
protected function someFunction()
{
//some functionality here
}
}
However, when instantiating ChildClass, the exception "Please define TEST_CONSTANT!" will be thrown, even though the constant was overridden. I understand that I can simply make it a mandatory parameter in the constructor, and set a member variable that way (which is probably the more logical/practical solution).
In my case, it might not make much sense to use a constant for this purpose, but I'd still like to understand why this does not work.
It should be possible to override constants in child classes. Does this override simply not occur until after the constructor is called? Is my check incorrect? Would be nice to understand the logic and sequence of events at play here.
You need to pass the argument to defined() as a string:
if (!defined('self::TEST_CONSTANT')) {
Otherwise, you're testing for the existence of a global constant called null (not 'null' but an actual null, which is pretty meaningless).... if you're trying to identify whether a global constant called value is defined, then you might also want to consider static::TEST_CONSTANT instead, which will take the value of static::TEST_CONSTANT from the child class that you've instantiated ('value') and test to see if a global constant with the name value has been defined.
You need to use late static building to access static child properties (and constants) from parent class:
abstract class ParentClass {
const TEST_CONSTANT = null;
public function __construct()
{
if (!defined(static::TEST_CONSTANT)) {
throw new Exception("Please define TEST_CONSTANT!");
}
}
abstract protected function someFunction();
}
Saying that, overriding constants looks a bit unusual. I am curious about usecase why you need it at all.
I realize that this question has already been asked elsewhere for different programming languages... But this is not a 100% indicator for the same answer in the PHP domain, so I am asking this question.
Could someone please tell me what, specifically in PHP, is the difference between "final static" and "const" ?
final
The methods or classes can not be modified by a child class. This prevents class inheritance, method-overriding and/or redefinition of methods.
Only class definitions and/or methods inside a class can be defined as
final.
static
Declares class methods or properties as a static value so that you have access to them without instantiating an object. These are shared between parent and child-classes.
A class definition can not be static unlike final.
const
These create a constant value for a class. The constant values will get changed and can NOT be changed by a method in either parent or child-class.
Class constants are allocated per instance of the class.
const is a type specifier in itself. It can not be put along with public/private/static etc. final, as mentioned before can be used along with any method or class definitions and hence; applicable with all of them. static can not be applied to class definitions but can be used for class properties.
UPDATE
modifiers are allowed for class constants since PHP 7.1.0.
class Foo {
public const bar = 5;
private const baz = 6;
}
To summarise, final static can not be used to define something like:
class X {
final static x = 5;
}
which is why you have a const.
final is not for class properties, only classes and methods. It means that the method cannot be overridden, or that the class cannot be inherited from. const is the PHP equivalent to a Java final variable.
They don't have anything at all in common, and they create completely different kinds of things. const declares a constant. final static declares a method which is static (can be called without an instance of the class) and final (can't be overridden by subclasses). static alone can be used to define a class-scoped variable, which isn't constant (but variables can't be final).
If I have a class structure with a value that can either be true or false, that doesn't change, currently implemented as variables would it be better to change them to constants, such as:
class Parent {
const BOOL_CONST = false;
...
}
class SomeChild extends Parent {
const BOOL_CONST = true;
...
}
Later I have an object which may be of any type in that class hierarchy, either the parent or one of its children, and some of the children may, like 'SomeChild' have overloaded the value to be true.
Is there some way I can access the constant without knowing the class? In other words can I do something like:
$object->BOOL_CONST
Or would it be better to leave these values as variables, even though they really shouldn't change?
UPDATE
I've reworded my question above to better express what I was attempting to ask.
Is there some way I can access the constant without knowing the class?
In other words can I do something like:
Yes, in order to reference a constant, you will want to use the following constructs:
self::NAME_OF_CONSTANT: give me a constant defined in this class; if I don't define it, get it from my parent
static::NAME_OF_CONSTANT: give me a constant defined in this class ONLY; never look to my parent for it
parent::NAME_OF_CONSTANT: give me a constant defined in my parent class ONLY; never look to myself for it
BTW, you used the term "overloaded"; however, I believe you meant to say "overridden". Overloading has a different semantic meaning in object oriented languages.
Constant as access with the double colon ::
Parent::BOOL_CONST
SomeChild::BOOL_CONST
within the class
parent::BOOL_CONST
self::BOOL_CONST
PHP 5.3 now accepts the object as the class reference: $this::BOOL_CONST is now accepted.
//
// http://php.net/manual/en/language.oop5.constants.php
//
// As of PHP 5.3.0, it's possible to
// reference the class using a variable.
// The variable's value can not be a keyword
// (e.g. self, parent and static).
//
// I renamed "Parent" class name to "constantes"
// because the classname "Parent" can be confused with "parent::" scope
class constantes
{
const test = false;
}
// I renamed "SomeChild" too, with no reason...
class OverloadConst extends constantes
{
const test = true;
public function waysToGetTheConstant()
{
var_dump(array('$this'=>$this::test)); // true, also usable outside the class
var_dump(array('self::'=>self::test)); // true, only usable inside the class
var_dump(array('parent::'=>parent::test)); // false, only usable inside the class
var_dump(array('static::'=>static::test)); // true, should be in class's static methods, see http://php.net/manual/en/language.oop5.late-static-bindings.php
}
}
// Classic way: use the class name
var_dump(array('Using classname' => OverloadConst::test));
// PHP 5.3 way: use the object
$object = new OverloadConst();
var_dump(array('Using object' => $object::test));
$object->waysToGetTheConstant();
Note that you can override a class constant, but not an interface constant.
If constantes is an interface that OverloadConsts implements, then you can not override its const test (or BOOL_CONST).
Sources
Constants in PHP 5.3: http://php.net/manual/en/language.oop5.constants.php
Late static Binding: http://php.net/manual/en/language.oop5.late-static-bindings.php
No, you can't access constants from an object context, but you could use reflection to grab the class of $object and then use :: to get BOOL_CONST. So:
$class = get_class($object);
$class::BOOL_CONST;
Okay, no, that's not technically reflection. Also, I'm not 100% sure if $class:: will resolve correctly. Use the actual ReflectionClass classes if the above doesn't work.
You cannot do $object->BOOL_CONST, since class constants have to be called statically (SomeChild::BOOLCONSTANT).
However, maybe you can try something like that: // edit: this works :)
$class = get_class($object);
$const = $class::BOOL_CONST;
I am learning about OO and classes, I have a couple of questions about OO and classes in PHP
As I understand it, a class that extends another class simply means that the class that extends the other class has access to the variables/properties and the functions/methods of the class that it is extending from. Is this correct?
I know that a static method or property are basically the same as a procedural function or variable outside of a class and can be used pretty much anywhere. Is this correct?
Public means any class can access it and Private means only the class that is is encapsulated in or a class that is extended from the owner of can access and use. Is this correct?
1) Yes, that's correct. A child class inherits any protected or public properties and methods of its parent. Anything declared private can not be used.
2) This is true. As long as the class is loaded (this goes well with your autoloading question from before), you can access static methods via the scope resolution operator (::), like this: ClassName::methodName();
3) You have the meaning of public correct, but as I mentioned earlier, private methods can only be used by the class they are declared in.
class parentClass
{
private $x;
public $y;
}
class childClass extends parentClass
{
public function __construct() {
echo $this->x;
}
}
$z = new childClass();
The above code will result in a NOTICE error being triggered, as $x is not accessible by childClass.
Notice: Undefined property:
childClass::$x
If $x was declared protected instead, then childClass would have access. Edit: A property declared as protected is accessible by the class that declares it and by any child classes that extend it, but not to the "outside world" otherwise. It's a nice intermediate between public and private.
For 1. As I understand it, a class that extends another class simply means that the class that extends the other class has access to the variables/properties and the functions/methods of the class that it is extending from. Is this correct?
ANS: That is correct but that is not all. The extending class can also customize the extended class by overriding the method of the extended class. And ofcouse, it can also extend the super class functionality by adding new fields and methods.
For 2. I know that a static method or property are basically the same as a procedural function or variable outside of a class and can be used pretty much anywhere. Is this correct?
ANS: Yes that is correct and as zombat said as long as the class is public and loaded and the property and method is public. In other word, you are using the class as name space of those elements.
For 3. Public means any class can access it and Private means only the class that is is encapsulated in or a class that is extended from the owner of can access and use. Is this correct?
ANS: Think of it as physical properties, public computer (at a library) can be used by everyone and your private computer (supposibly) can only be used by you.
Just to added to Zambat comment.
There's very little need to declare anything private, as a general rule use protected instead.