To create a class in PHP we use the keyword class succeeding by class name. Inside the class, we create functions that will be class the methods. To create simple inheritance use the class keyword succeeding by extends keyword and parent class name. And to define an object we use the new keyword
Syntax
class "class_name"
{
function "method_name"("parameters")
{
// code block
}
}
class "second_class_name" extends "class_name"
{
function "method_name"("parameters")
{
// code block
}
}
Step 1: Accept the two numbers into the variables num1 and num2
Step 2: Create the Subtraction class object obj
Step 3: Call the function add(num1, num2) by using the object obj to add the numbers
Step 4: Call the function sub(num1, num2) by using the object obj to subtract the numbers
Step 1: Assign the computed value of 'num1 + num2' to the variable sum
Step 2: Print the value of the variable sum as the sum of num1 and num2
Step 1: Assign the computed value of 'num1 - num2' to the variable sub
Step 2: Print the value of the variable sub as the subtraction of num1 and num2
<?php
class Addition
{
function add($num1, $num2)
{
$sum = $num1 + $num2;
echo "$num1 + $num2 = $sum";
}
}
class Subtraction extends Addition
{
function sub($num1, $num2)
{
$sub = $num1 - $num2;
echo "\n$num1 - $num2 = $sub";
}
}
$num1 = readline("Enter the 1st number: ");
$num2 = readline("Enter the 2nd number: ");
$obj = new Subtraction;
$obj->add($num1, $num2);
$obj->sub($num1, $num2);
?>
Enter the 1st number: 48 Enter the 2nd number: 15 48 + 15 = 63 48 - 15 = 33
