Matching Named Arguments

matchNamedAguments.php

<?php

function matchNamedArguments($target, $arguments = array())
{
    if (!is_array($arguments) && !$arguments instanceof \ArrayAccess) {
        throw new \InvalidArgumentException('$arguments for ' . __CLASS__ . ' must be array or ArrayAccess');
    }

    if (is_string($target) || $target instanceof \Closure) {
        $r = new \ReflectionFunction($target);
        $rps = $r->getParameters();
    } elseif (is_array($target) && count($target) == 2) {
        $r = (is_string($target[0])) ? new \ReflectionClass($target[0]) : new \ReflectionObject($target[0]);
        $method = strtolower($target[1]);
        if (!$r->hasMethod($method)) {
            throw new \Exception('Unknown callable method ' . $method);
        }
        $rps = $r->getMethod($method)->getParameters();
    } else {
        throw new \Exception('Unknown callable');
    }

    $dispatchParams = array();
    foreach ($rps as $rp) {
        $paramName = $rp->getName();
        if (isset($arguments[$paramName])) {
            // call-time arguments get priority
            $dispatchParams[] = $arguments[$paramName];
        } elseif ($rp->isOptional()) {
            // use default specified by method signature
            $dispatchParams[] = $rp->getDefaultValue();
        } else {
            // otherwise, null
            $dispatchParams[] = null;
        }
    }
    return $dispatchParams;
}