PHP Default Arguments

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<?php 

function one_ping($host = "google.com") {
	echo "<pre>";
	system ("ping ". $host);
	echo "</pre>";
}

one_ping("yahoo.com");

?>

The function "one_ping" has a default argument of "google.com" assigned to the parameter $host. This means that if an argument is not passed when the function is called, it will use "google.com" as the default value for the $host parameter.

Using default arguments in functions can be useful in situations where you want to provide a default value for a parameter, but still allow the user to override it if needed. This can make the function more flexible and easier to use.