Preventing main file functions from being global

[NotionCommotion]

How can I add a function to my main PHP file, yet not let it be available withing a class?  For instance, prevent baseFunction() from being available within foo.

<?php
class foo{
    public function bar()
    {
        echo(baseFunction()); //Global
        echo($baseVariable);  //Not global
    }
}

function baseFunction()  {return 'baseFunction';}
$baseVariable='baseVariable';

$foo=new foo();
$foo->bar();

[Jacques1]

What exactly are you trying to achieve?

 

The only way to get a truly local function is to use a closure (anonymous function):

<?php

class Foo
{
    public function bar()
    {
        // cannot be called here
        $baseFunction();
    }
}



// closure
$baseFunction = function () { echo 'Closure'; };

// can be called here
$baseFunction();

$foo = new Foo();
$foo->bar();

Or you could use namespaces. This doesn't actually hide the function, but it makes it harder to access it.

Edited July 3, 2016 by Jacques1

[NotionCommotion]

What exactly are you trying to achieve?

 

I always have a single file index.php which does a little work, creates an object from a class, and does something.  Sometimes a function in that file will make the code more concise, however, felt that it shouldn't be global.

[Jacques1]

If the project is mostly object-oriented, consider moving the logic from the main script into a separate class. This will immediately solve the scoping issues and is generally cleaner.

 

Or use closures as explained above. But I feel this is more like a hack.

[NotionCommotion]

Thanks Jacques1,  Will go for the separate class approach, but will consider the closure solution when it makes sense.

[requinix]

I'd avoid the closures: they come with increased memory usage that does not get cleaned up until you use hundreds or thousands of closures. By design, which I still don't understand but is intentional.

 

If you want non-global functions, use namespaces or utility classes.