Prevent class method to be executed if parameters missing

[flaab]

Hi =)

 

You see i want to prevent a class method to be executed if any parameters are missing

 

Example code:

 

class foo{

        public function whatever($param1, $param2, $param3)
        {
                  // Whatever logic
        }

}

 

Well, if I execute it without any required parameter...it displays a warning message in the browser and get executed badly!

 

I want the method NOT to be executed if some parameter is missing. How can i do that?

 

Thanks.

[micah1701]

can you just add something like

 

if(!isset($param1) || !isset($param2) || !isset($param3)){

return false;

}

[lemmin]

That will still give the missing param warning. Try this:

class foo{

       public function whatever($param1=null, $param2=null, $param3=null)
       {
                 if ($param1==null || $param2==null || $param3==null)
                     return false;
       }

}

[micah1701]

That will still give the missing param warning. Try this:

class foo{

        public function whatever($param1=null, $param2=null, $param3=null)
        {
                  if ($param1==null || $param2==null || $param3==null)
                      return false;
        }

}

 

good call!

[flaab]

Thabks for your answers!

 

But I need that to be done from outside of the method code, not from inside.

 

The params are given by an url mapper.

 

I need to convert that warning into an execution error.

 

Ideas?

 

 

[micah1701]

then use the same code snippet provided, but check it before calling the function...

[lemmin]

Why would you have to do it outside the function? If you change the "return false;" to "die("EXCEPTION ERROR");" you should get what you are looking for. If you don't have access to the function, why don't you just check that all the variables are set before executing the function, as micah1701 suggested?

[flaab]

I need it to be from outside of the function code cause i'm programming a web developing framework that should not allow any action to be executed if some parameters are missing in the URL.

 

 

http://www.whatever.com/foo/whatever/param1/param2 will execute the method "whatever" of the class "foo". But if the "whatever" method needs 3 parameters as those in the previos examples, the method "whatever" should not be executed and an error message should be displayed instead, because the result of the method execution would be corrupt.

 

 

I do not know how many parameters are going to need the functions programmed by the framework's users, so I need a general solution.

 

Is there a php function that returns how many parameters does a certain function require to be executed?

 

Ideas? Thanks!

[Jessica]

I think you might be going about this the wrong way.

But anyway I don't think there is a function like what you're asking. You'd have to define somewhere how many arguments each function needs.

Or edit the core PHP code, I guess?