How to create default function parameter in PHP?
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 $name here, holds the parameter value.
Below examples illustrate the procedure to create and use the default function parameter:
Example 1:
<?php function greeting($name="GeeksforGeeks") { echo "Welcome to $name "; echo("\n"); } greeting("Gfg"); // Passing no value greeting(); greeting("A Computer Science Portal"); ?> |
Output:
Welcome to Gfg Welcome to GeeksforGeeks Welcome to A Computer Science Portal
Example 2:
<?php function welcome($first="GeeksforGeeks", $last="A Computer Science Portal for Geeks") { echo "Greeting: $first $last"; echo("\n"); } welcome(); welcome("night_fury"); welcome("night_fury","Contributer"); ?> |
Output:
Greeting: GeeksforGeeks A Computer Science Portal for Geeks Greeting: night_fury A Computer Science Portal for Geeks Greeting: night_fury Contributer
