PHP program to demonstrate the use of default arguments

Program/Source Code:

The source code to demonstrate the use of default arguments is given below. The given program is compiled and executed successfully.

<?php
//PHP program to demonstrate the 
//use of default arguments.
function Sum($num1, $num2 = 20)
{
    $num3 = $num1 + $num2;
    return $num3;
}

$num3 = Sum(10, 30);
echo "Sum: " . $num3 . "<br>";

$num3 = Sum(10);
echo "Sum: " . $num3 . "<br>";
?>

Output:

Sum: 40
Sum: 30

Explanation:

In the above program, we created a user define function Sum() that contains two arguments $num1 and $num2.

function Sum($num1, $num2=20);

Here, we used $num2 as a default argument, if we pass only one value to the function then 20 will be used for $num2.

$num3=Sum(10,30);
echo "Sum: ".$num3."<br>"; 

In the above code, we pass two arguments then the sum of 10 and 30 assigned to the variable $num3 and printed on the webpage.

$num3=Sum(10);
echo "Sum: ".$num3."<br>"; 

In the above code, we pass only one argument then the sum of 10 and 20 assigned to the variable $num3 and printed on the webpage.