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 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

Next TopicPHP Variable Length Argument Function

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PHP Default Argument Values Function

Example 1

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

Example 2

Example 3