PHP Function named after the Value of a Variable

Question

I have a PHP function that I need to create that executes PHP or HTML Code that is stored in a variable. That's one problem. Another problem is the fact that the function will be created multiple times and will need a unique name so I've named it after $title but I'm not sure if this will create the function from the value of $title or if it will create a function called $title or if it just won't work. This is my code:

$title = $_POST['sogo_aso_name'];
$output = $_POST['sogo_aso_output'];

Some Code Here...

function $title ($output)
{
    //Some Code Here to execute $output...
}

So... That's my problem. I'm not sure what will execute the $output cleanly so it can be shown on a page. And I don't know if the function will be named after the value of $title

Thanks for any help!

Ethan Brouwer

Why do you need a unique function with a new name each time? Pass these parameters to a single function and process the data accordingly. — Yan Berk
– Yan Berk, Commented Jul 7, 2012 at 12:12
Don't use eval(). It is a dangerous function and its use is discouraged. — Yan Berk
– Yan Berk, Commented Jul 7, 2012 at 12:20

Leri · Accepted Answer · 2012-07-07 12:16:51Z

2

You can use call_user_func like this:

call_user_func($title, $output);

But it's really strange to change name of one function.

answered Jul 7, 2012 at 12:16

Leri

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3 Comments

Ethan Brouwer Over a year ago

I know it's strange. I'm making a wordpress plugin that lets you add your own screen options to any page, but the code that I use needs a function for every option that will be executed when the option is clicked and also to save the values. Thanks though! This is what I need.

Leri Over a year ago

@EthanBrouwer IMO, this way is dangerous. You get $title from post, what will happen if input, submitted by user, contains ;? I'd suggest to think on different solution for your situation, but this will still work until you get better way. Good luck.

Mahn Over a year ago

For the record $title($output); should also work in the most recent versions of PHP. But make sure you filter $title properly if you are collecting it from POST, this is hella dangerous otherwise.

David Barker · Accepted Answer · 2012-07-07 12:30:12Z

What you're trying to do is unfortunately not possible. You could create namespaces if you need a common name to prefix your functions with.

namespace fArr {
    function func1 (args) {}
    function func2 (args) {}
}

To call them you can use:

namespace {
    fArr\func1($title, $output);
}

Generally you want to avoid creating totally anonymous functions. Maybe create a function that handles the title and output for all requests. Alternatively create a new object with the func name as a property and output assigned to it.

$title  = $_POST['sogo_aso_name'];
$output = $_POST['sogo_aso_output'];

// Store data in an object named after the value of $title
// Note that constant use of this can get very messy, and very confusing
$$title = (object) array('output' => $output);

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