Php: Setter and getter methods

 while developing applications, we will not provide direct access to the properties. Instead, we create a private properties and provide public getter, setter methods to read and update the property values.

 

Why setter and getter methods?

These are used to pre-process and validate the date before updating/returning actual property values.

 

Example

public function set_age($age){
    if($age < 18){
        trigger_error("Minors are not supposed to do work");
    }

    $this->age = $age;
}

 

If age is < 18, set_age method throws error, else it set the property $age of Employee instance.

 

setter_getter_methods_demo.php

 

#!/usr/bin/php

<?php

    class Employee{
        private $id;
        private $name;
        private $age;

        public function get_id(){
            return $this->id;
        }

        public function set_id($id){
            if($id <= 0){
                trigger_error("id must be > 0");
            }
            $this->id = $id;
        }

        public function get_name(){
            return $this->name;
        }

        public function set_name($name){
            if(!isset($name) || trim($name) === ''){
                trigger_error("name must not be null or empty");
            }
            $this->name = $name;
        }

        public function get_age(){
            return $this->age;
        }

        public function set_age($age){
            if($age < 18){
                trigger_error("Minors are not supposed to do work");
            }

            $this->age = $age;
        }

        public function about_me(){
            echo "id : $this->id\n";
            echo "name : $this->name\n";
            echo "age : $this->age\n";
        }
    }

    $emp1 = new Employee();
    $emp1->set_id(2);
    $emp1->set_name("Krishna");
    $emp1->set_age(32);

    $emp1->about_me();
   
?>

 

Output

$./setter_getter_methods_demo.php 

id : 2
name : Krishna
age : 32

 

 

 

 

 

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