Question

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Can I use operators as function callback in PHP?

Is it possible to use an operator like a function in PHP?

For example, I’ve written a little function that looks like this:

function aggregate($values,$function,$initial=null) {
    $agg = $initial === null ? array_shift($values) : $initial;
    while($values) {
        $agg = call_user_func($function,$agg,array_shift($values));
    }
    return $agg;
}

I’m wondering if it would be possible to call it with something like

 agggregate(array(1,2,3),'+');

Which would yield 1+2+3=6.

If not, I guess I could call it like this:

 agggregate(array(1,2,3),function($a,$b){return $a+$b;});

But it’s not as compact.

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I just noticed this is identical to array_reduce; it’s not necessary to point this out 😉

Answer 1

Using the anonymous function is the way to go in PHP. Unfortunately it does not have something like python’s operator module.