Public Private Php
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Public Private Php
What is the difference between public, private, and protected in PHP?
Difficulty Level :
Hard
Last Updated :
15 Oct, 2018
public $tag_line = "A Computer Science Portal for Geeks!" ;
echo $this ->tag_line. "" ;
// A Computer Science Portal for Geeks!
// A Computer Science Portal for Geeks!
// A Computer Science Portal for Geeks!
echo $sum = $this ->x- $this ->y . "" ;
function mul() //Multiply Function
echo $sub = $this ->x* $this ->y;
private $name = "A Computer Science Portal for Geeks!" ;
echo "This is private method of base class" ;
// Uncaught Error: Call to private method demo::show()
protected $protected = 'Protected' ;
private $private = 'Private' ;
echo $this -> protected ;
echo $obj -> protected ; // Cannot access protected property
echo $obj -> private ; // Cannot access private property
$obj ->Display(); //Displays all properties
public $public = 'Public Sub Class' ;
protected $protected = 'Protected Sub Class' ;
echo $this -> protected ;
echo $obj2 -> protected ; // Cannot access protected property
echo $obj2 -> private ; // Cannot access priavte property
$obj2 ->Display(); //Displays all properties
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Public, private and protected are called access modifiers. Just like C++, PHP also have three access modifiers such as public, private and protected. The visibility of a property, a method or a constant can be defined by prefixing the declaration with these keywords.
Public Access modifier: This modifier is open to use inside as well as outside the class.
Example:
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Protected Access modifier: This modifier is open to use within the class in which it is defined and its parent or inherited classes.
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code
Private Access modifier: This modifier is open to use within the class that defines it. ( it can’t be accessed outside the class means in inherited class).
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php - What is the difference between public , private ... - Stack Overflow
What is the difference between public , private , and protected in PHP ?
PHP Access Modifiers - Public , Private and Protected
Public Private Protected in PHP - Phptpoint.com
PHP 5.6 и PHP 7 на русском: Область видимости
class Customer {
private $name;
public function setName($name) {
$this->name = $name;
}
public function getName() {
return $this->name;
}
}
$c = new Customer();
$c->setName(“Stuart Broad”);
echo $c->name; //error, $name cannot be accessed from outside the class
//$name can only be accessed from within the class
echo $c->getName(); //this works, as the methods of the class have access
//to the private data members or methods
public function setName ( $name ) {
public function getName ( ) {
$c - > setName ( “ Stuart Broad ” ) ;
echo $c - > name ; //error, $name cannot be accessed from outside the class
//$name can only be accessed from within the class
echo $c - > getName ( ) ; //this works, as the methods of the class have access
//to the private data members or methods
class Customer {
public $name;
public function setName($name) {
$this->name = $name;
}
public function getName() {
return $this->name;
}
}
$c = new Customer();
$c->setName(“Stuart Broad”);
echo $c->name; // this will work as it is public.
$c->name = “New Name” ; // this does not give an error.
public function setName ( $name ) {
public function getName ( ) {
$c - > setName ( “ Stuart Broad ” ) ;
echo $c - > name ; // this will work as it is public.
$c - > name = “ New Name ” ; // this does not give an error.
class Customer {
protected $name;
public function setName($name) {
$this->name = $name;
}
public function getName() {
return $this->name;
}
}
class DiscountCustomer extends Customer {
private $discount;
public function setData($name, $discount) {
$this->name = $name; //this is storing $name to the Customer
//class $name variable. This works
// as it is a protected variable
$this->discount = $discount;
}
}
$dc = new DiscountCustomer();
$dc->setData(“Stuart Broad”,10);
echo $dc->name; // this does not work as $name is protected and hence
// only available in Customer and DiscountCustomer class
public function setName ( $name ) {
public function getName ( ) {
class DiscountCustomer extends Customer {
public function setData ( $name , $discount ) {
$this - > name = $name ; //this is storing $name to the Customer
//class $name variable. This works
$this - > discount = $discount ;
$dc = new DiscountCustomer ( ) ;
$dc - > setData ( “ Stuart Broad ” , 10 ) ;
echo $dc - > name ; // this does not work as $name is protected and hence
// only available in Customer and DiscountCustomer class
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Access specifiers are used as a key component of Encapsulation and Data Hiding. By using either of the access specifiers mentioned above i.e. public , private or protected you can hide or show the internals of your class to the outside world.
A private access specifier is used to hide the data member or member function to the outside world. This means that only the class that defines such data member and member functions have access them. Look at the example below:
In the above example, echo $c->name will give you an error as $name in class Customer has been declared private and hence only be accessed by its member functions internally. Therefore, the following line echo $c->getName() will display the name.
A public access specifier provides the least protection to the internal data members and member functions. A public access specifier allows the outside world to access/modify the data members directly unlike the private access specifier. Look at the example below:
In the above example, echo $c->name will work as it has been declared as public and hence can be accessed by class member functions and the rest of the script.
A protected access specifier is mainly used with inheritance. A data member or member function declared as protected will be accessed by its class and its base class but not from the outside world (i.e. rest of the script). We can also say that a protected data member is public for the class that declares it and it’s child class; but is private for the rest of the program (outside world).
Look at the example below:
In the above example, echo $dc->name will not work work $name has been defined as a protected variable and hence it is only available in Customer and DiscountCustomer class.
Important Note of Access Specifier in PHP5
In PHP5, access specifiers are public by default. This means that if you don’t specify an access specifier for a data member or method then the default ‘public’ is applicable.
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