How to transform a php $string into a $string() function call?

Question

My current code:

$operation = "alienFunction";
switch($operation){
        case "alphaFunction":
            alphaFunction();
            break;
        case "betaFunction":
            betaFunction();
            break;
        case "alienFunction":
            alienFunction($kidsPerPlanet, $planet);
            break;

Ok, I have a big list of functions. Some functions have parameters and some have not. The $operation is received from a $_POST variable. I want to do something like this:

$operation = "alphafunction";
$operation();

Or

$operation = "alienFunction";
$operation($kidsPerPlanet, $planet);

I think you're looking for call_user_func_array. Also you may want to look into the factory pattern to avoid such a huge switch. — Andrei
– Andrei, Commented Jun 3, 2015 at 15:05

Rizier123 · Accepted Answer · 2015-06-03 15:06:57Z

1

As already written in the comments you are looking for call_user_func_array(). Just use it like this:

call_user_func_array($functionName, $argumentArray);

But since you don't know which function you call with which parameters, just define an array and then use the code above, e.g.

$arguments = [
        "alphaFunction" => [],
        "betaFunction" => [],
        "alienFunction" => [$kidsPerPlanet, $planet],
    ];

call_user_func_array($functionName, $arguments[$functionName]);

answered Jun 3, 2015 at 15:06

Rizier123

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Comments

Rodmentou · Accepted Answer · 2015-06-03 15:48:51Z

0

Excellent. Thanks, guys. For functions with no parameters, it's working perfectly. I'm trying this now:

$userInfo = MySQL_FETCH_ARRAY( MySQL_QUERY( ($autoAuth) ) );
CALL_USER_FUNC_ARRAY($operation, $userInfo);

Inside of one of functions, I have this piece of code inserted into HTML:

ECHO "<p>" . VAR_DUMP($userInfo) . "</p>";

And the result gives me "string(2) "25".

I'm new here. So I don't know what to do. For sure, my question is answered. Now I know how to use a string to call a function. Should I close this, select the best answer and create another question? Should I let it open, while my WHOLE problem is solved? Or should I close it and still comment here to get feedback?

Thanks a lot. I'm loving this. I wish that I can contribute as soon as possible too. :)

answered Jun 3, 2015 at 15:48

Rodmentou

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3 Comments

Rizier123 Over a year ago

The best would have been to write this as a comment. But I don't really see what the question now is here. Maybe you want to write a new separate question where you explain what your exact problem is. (Make sure you include: Your current code, your current output and your expected output into your question)

Rodmentou Over a year ago

Ok, thank you. :) The question was that the CALL_USER_FUNC_ARRAY($operation, $userInfo) was giving an string to my function. So, I've changed it to CALL_USER_FUNC_ARRAY($operation, array($userInfo)); :)

Rizier123 Over a year ago

^ Nice, that you could figure it out. Yes as the function name already says, call_user_func_array() takes an array as arguments for the function

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