Passing a function as an argument to another

[Algernon83]

There's a point in my code where it's useful for a particular function to take another function as an argument. There's no trouble doing this with functions in the global scope, but I want to be able to pass it a method of a class (as in Class::Method). Unfortunately, it fails with a message of "undefined function: class::method". Is there a better fix for this than making a wrapper function, as I have it now?

 

[trollacious]

Without seeing the relevant code (concise as possible), it's difficult to give you an answer beyond "Yes" or "No".

Lee

 

[Algernon83]

Here's a mock-up.

class myclass
{
function mymethod($foo)
{
echo $foo;
}
}

function callanotherfunction($f, $x)
{
return $f($x);
}

function wrapper($foo)
{
return myclass::mymethod($foo);
}

// Causes an error
//callanotherfunction("myclass::mymethod", "Hello, world!");

// Works
callanotherfunction("wrapper", "Hello, world!");

 

[trollacious]

Have you tried:

callanotherfunction("myclass[red]->[/red]mymethod", "Hello, world!");

Lee

 

[Algernon83]

Actually, that's doesn't work even if you don't use it as a callback function, e.g.

myclass->mymethod("Hello, world!");

because myclass is a class, not an object of that class.

 

[sleipnir214]

That should only work with a class that has been instantiated into an object.


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