PHP reflection and invokeArgs(): forcing a parameter to use its default value

Question

I need to call a function using the Reflection API. The function has optional parameters, and I need to invoke it providing just some of them.

For example, I have this function:

public function doSomething($firstParam, $secondParam = "default", $thirdParam = "default)

And I'm using invokeArgs() to invoke doSomething(), passing an array of values representing the arguments omitting to set a value to the optional $secondParam:

$parameters = array("firstParam"=>"value", "thirdParam"=>"thirdValue");
$reflectedDoSomething->invokeArgs($instance, $parameters);

What happens here is that invokeArgs() invokes the method setting its parameters in a row, without skipping the $secondParam, that now is valued "thirdValue" and omitting the $thirdParam. And that's logically correct. The method is invoked like doSomething("value", "thirdValue").

What I'd like to do here is to force the $secondParam to use its default value. Setting "secondParam" => null in the $parameters array is not a solution because null is a value.

Is it possibile using Reflection?

Thanks

ircmaxell · Accepted Answer · 2011-01-23 03:13:23Z

2

See the first comment on the docs for invokeArgs().

So, just run the params through a simple algorithm (you could create a function for wrapping this if you wanted to):

$reflection = new ReflectionMethod($obj, $method); 

$pass = array(); 
foreach($reflection->getParameters() as $param) { 
   /* @var $param ReflectionParameter */ 
   if(isset($args[$param->getName()])) { 
       $pass[] = $args[$param->getName()]; 
   } else { 
       $pass[] = $param->getDefaultValue(); 
   } 
} 
$reflection->invokeArgs($obj, $pass);

answered Jan 23, 2011 at 3:13

ircmaxell

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Comments

Vlad · Accepted Answer · 2011-01-23 03:13:18Z

1

How about not setting the associative name secondParam, but rather putting a null as a second second parameter.

$parameters = array("firstParam"=>"value", null, "thirdParam"=>"thirdValue");

answered Jan 23, 2011 at 3:13

Vlad

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