PHP Default Argument Values Function

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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 example 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

Since PHP 5, you can use the concept of default argument value with call by reference also.

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

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