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How to create default function parameter in PHP?

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  • Last Updated : 26 Nov, 2022
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The default parameter concept comes from C++ style default argument values, same as in PHP you can provide default parameters so that when a parameter is not passed to the function. Then it is still available within the function with a pre-defined value. This function also can be called optional parameter. Syntax:

function greeting($name=" parameter_value ")

Parameter: This function accepts a single parameter that is $name here, holds the parameter value. Below examples illustrate the procedure to create and use the default function parameter: Example 1: 

php




<?php 
    function greeting($name="GeeksforGeeks")
    
        echo "Welcome to $name "; 
        echo("\n");
    
    greeting("Gfg");
 
    // Passing no value
    greeting();
    greeting("A Computer Science Portal"); 
?> 

Output:

Welcome to Gfg 
Welcome to GeeksforGeeks 
Welcome to A Computer Science Portal 

Example 2: 

php




<?php   
    function welcome($first="GeeksforGeeks",
                     $last="A Computer Science Portal for Geeks")
                     {   
                        echo "Greeting: $first $last";  
                        echo("\n");
    }   
    welcome(); 
    welcome("night_fury"); 
    welcome("night_fury","Contributor"); 
?>   

Output:

Greeting: GeeksforGeeks A Computer Science Portal for Geeks
Greeting: night_fury A Computer Science Portal for Geeks
Greeting: night_fury Contributor

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