Question

I have a list of functions a(), b(), c()
I have a main() function.

Depending on case, I need to pass a different function to main() to use.
In javascript it would be:

var a = function(){}
var b = function(){}
var c = function(){}

var func = (some logic) a, b or c;

main(func);

How do I do that in php5.3?
I am trying to avoid using

$func_name = "a";
main($func_name){
   $func_name();
}

Or may be it is the best way, and I should not use closures of any type?

Answer 1

Same idea in PHP 5.3, as you can create anonymous functions:

$sayHello = function($var)
{
    echo "Hello ", $var;
};

// Logic here to determine what $func is set to
$func = $sayHello;    

function callCustom($function)
{
    if(!is_callback($function))
    {
        // throw exception
    }
    $function("World");
}

callCustom($func);  // Hello World