How to set default input values for php function.

//Basically we use short if method.

function show_my_name (   $name , $age ) {
    return ‘My name is  ’.$name.’  and I am ‘.$age.’  years old’;
}
$name = $_GET['name'];
$age = $_GET['age'];
echo show_my_name( !empty($name) ? $name : ‘unnamed’ , !empty($age) ? $name : ‘more than 18′ );

//So , now if we have name not defined and age 25 the function will return

My name is unnamed and I am 25 years old.