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Function Overloading and Overriding in PHP
Function Overloading in PHP
Function overloading is a feature that permits making creating several methods with a similar name that works differently from one another in the type of the input parameters it accepts as arguments.
Example
Let us now see an example to implement function overloading−
<?php
class Shape {
const PI = 3.142 ;
function __call($name,$arg){
if($name == 'area')
switch(count($arg)){
case 0 : return 0 ;
case 1 : return self::PI * $arg[0] ;
case 2 : return $arg[0] * $arg[1];
}
}
}
$circle = new Shape();
echo $circle->area(3);
$rect = new Shape();
echo $rect->area(8,6);
?>Output
This will produce the following output−
9.42648
Function Overriding in PHP
In function overriding, the parent and child classes have the same function name with and number of arguments
Example
Let us now see an example to implement function overriding−
<?php
class Base {
function display() {
echo "
Base class function declared final!";
}
function demo() {
echo "
Base class function!";
}
}
class Derived extends Base {
function demo() {
echo "
Derived class function!";
}
}
$ob = new Base;
$ob->demo();
$ob->display();
$ob2 = new Derived;
$ob2->demo();
$ob2->display();
?>Output
This will produce the following output−
Base class function! Base class function declared final! Derived class function! Base class function declared final!
Updated on: 02-Jan-2020
10K+ Views
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