tarsana / functional

try.php

<?php

function numberOfArgs($fn) {
    $reflector = is_array($fn) ?
        new ReflectionMethod($fn[0], $fn[1]) :
        new ReflectionFunction($fn);
    return $reflector->getNumberOfParameters();
}

function curry($fn) {
    return curriedFunction($fn, numberOfArgs($fn));
}

function curriedFunction($fn, $argsCount, $boundArgs = []) {
    return function() use($fn, $argsCount, $boundArgs) {
        $boundArgs = array_merge($boundArgs, func_get_args());

Consider using a different name than the imported variable $boundArgs, or did you forget to import by reference?

        if (count($boundArgs) >= $argsCount)
            return call_user_func_array($fn, $boundArgs);
        return curriedFunction($fn, $argsCount, $boundArgs);
    };
}

$add = function($x, $y) {
    return $x + $y;
};

$add = curry($add);

$add2 = $add();

$increment = $add(1);

echo $increment(1, 2);