PHP - Default Argument Values Function

PHP allows you to define C++ style default argument values. In such case, if you don't pass any value to the function, it will use default argument value.

Let' see the simple examples of using PHP default arguments in function.

Example 1:

<?php  

function sayHello($name="Ram"){  

echo "Hello $name<br/>";  

}  

sayHello("Sonoo");  

sayHello();//passing no value  

sayHello("Vimal");  

?>  

Output:

Hello Sonoo

Hello Ram

Hello Vimal

Example 2

<?php    

function greeting($first="Sonoo",$last="Jaiswal"){    

echo "Greeting: $first $last<br/>";    

}    

greeting();  

greeting("Rahul");  

greeting("Michael","Clark");  

?>    

Output:

Greeting: Sonoo Jaiswal

Greeting: Rahul Jaiswal

Greeting: Michael Clark

Example 3

<?php  

function add($n1=10,$n2=10){  

$n3=$n1+$n2;  

echo "Addition is: $n3<br/>";  

}  

add();  

add(20);  

add(40,40);  

?>  

Output:

Addition is: 20

Addition is: 30

Addition is: 80