I want to define a function doSomething(arg1, arg2) with default values to arg1=val and arg2=val
When I write
function doSomething($arg1="value1", $arg2="value2"){
// do something
}
Is it possible now to call doSomething with default arg1 and arg2="new_value2"
Sometimes if I have a lot of parameters with defaults, I'll use an array to contain the arguments and merge it with defaults.
public function doSomething($requiredArg, $optional = array())
{
$defaults = array(
'arg1' => 'default',
'arg2' -> 'default'
);
$options = array_merge($defaults, $optional);
}
Really only makes sense if you have a lot of arguments though.
Nope, sadly, this is not possible. If you define $arg2, you will need to define $arg1 as well.
function doSomething( $arg1, $arg2 ) {
if( $arg1 === NULL ) $arg1 = "value1";
if( $arg2 === NULL ) $arg2 = "value2";
...
}
And to call:
doSomething();
doSomething(NULL, "notDefault");
^^^^^^^-----DEFAULT----^^^^^^^^^^ to use instead. You could then doSomething(default, "notDefault");Do you ever assign arg1 but not arg2? If not then I'd switch the order.
Optional Parametersmove over to ASP.Net 4.0 ;)named parameterswhere you could, as a PHP example, calldoSomething($arg2="value2"). This is valid PHP syntax but do not be fooled into thinking it works as a named parameter.