Function Overriding :
Function definitions in child classes override definitions with the same name in parent classes. In a child class, we can modify the definition of a function inherited from parent class.
<?php
class abc
{
var $a;
var $b;
function cal($p,$q)
{
$this->a=$p;
$this->b=$q;
$sum=$this->a+$this->b;
echo”it is addition of two parameters”.$sum;
}
}
class xyz extends abc
{
var $a;
var $b;
var $c;
var $d;
function cal($p,$q)
{
$this->a=$p;
$this->b=$q;
$sum=$this->a*$this->b;
echo”multiplication of two parameters”.$sum;
}
}
$obj=new xyz();
$obj->cal(5,2);
?>
Function Overloading using function __call :
<?Php
Class Test12
{
Public Function __call($Name, $Arguments)
{
If ($Name === ‘Test’){
If(Count($Arguments) === 1 ){
Return $This->Test1($Arguments[0]);
}
If(Count($Arguments) === 2){
Return $This->Test2($Arguments[0], $Arguments[1]);
}
If(Count($Arguments) === 3){
Return $This->Test3($Arguments[0], $Arguments[1],$Arguments[2]);
}
}
}
Private Function Test1($Data1)
{
Echo $Data1;
}
Private Function Test2($Data1,$Data2)
{
Echo $Data1.’ ‘.$Data2;
}
Private Function Test3($Data1,$Data2,$Data3)
{
Echo $Data1.’ ‘.$Data2.$Data3;
}
}
$Test = New Test12();
$Test->Test(‘One Argument’); //Echoes “One Argument”
$Test->Test(‘Two’,’Arguments’);
$Test->Test(‘Three’,’Om’,’Test’); //Echoes “Two Arguments”
?>