Difference between Public, Private and Protected in PHP || Access Modifiers in PHP

Difference between Public, Private and Protected in PHP

Last Updated by Pooja Chikara 24-Mar-20

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To decide the scope of a variable or a function, in PHP we have mainly three access modifiers in PHP.

Access Modifiers:

Access modifiers are basically PHP Keywords which set the accessibility of the variables and methods. We can also set the accessibility of variables and functions of a class by setting the accessibility of class.

These are used in Inheritance to define the scope of instances of parent and child classes.

Syntax:
These are used before the name of variables, functions and classes.

1. Public:

This keyword used to make variables and functions accessible to anywhere means we can access either inside a class or anywhere outside the class.

Example:

<?php
class Employees_details {
  public $employee_name;
  public $employee_id;
}
$obj = new Employees_details();  // creating the object of Employees_details class
 $obj->employee_name = 'Ramesh';
 $obj->employee_id = '1221';
echo $obj->employee_name;
echo '<br>'.$obj->employee_id;
?>

Output:

Difference between Public, Private and Protected in PHP


2. Protected:

This keyword used to make variables and functions accessible into that class and its child or derived classes.

Example:

<?php
class Employees_details {
 protected $employee_name;
}
$obj = new Employees_details(); // creating the object of Employees_details class
$obj->employee_name = 'Ramesh'; // it will give fatal error
?>

Output:

Difference between Public, Private and Protected in PHP

We can access protected properties by public functions of that class or by public functions of that child classes.

Example:

<?php
class Employees_details {
  protected $employee_name;
  function get_employee($emp_name){
     $this->employee_name=$emp_name;
     echo $this->employee_name;
  }
}
$obj = new Employees_details();  // creating the object of Employees_details class
$obj->get_employee("Pooja");
?>

Output:

Difference between Public, Private and Protected in PHP


3. Private:

This keyword used to make variables and functions accessible only into that class means we can't access private properties outside the class.

Example:

<?php
class Employees_details {
  private $employee_name;
}
$obj = new Employees_details(); // creating the object of Employees_details class
 $obj->employee_name = 'Ramesh'; // it will give fatal error
?>

Output:

Difference between Public, Private and Protected in PHP

We can access protected properties by public functions of that class.

Example:

<?php
class Employees_details {
  private $employee_name;
}
  function get_employee($emp_name){
	$this->employee_name=$emp_name;
        echo $this->employee_name;
  }
}
$obj = new Employees_details();  //creating the object of Employees_details class
$obj->get_employee("Pooja");
?>

Output:

Difference between Public, Private and Protected in PHP



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