call_user_func_array() args with strings as keys to match function args names

Question

At the moment I have something like this

function callFunction($method, $args) {
    if(method_exists($this, $method)) {
            call_user_func_array(array($this, $method), $args);
    }
}

function myfunction ($hello, $world, $blah) {
}

where $args is an array like [0] => 'string1', [1] => 'string2', [2] => 'string3' which gets passed to the function in that order. However would there be a way to have the keys to the args match the functions argument names. like ['hello'] => 'string1', ['world'] => 'string2', ['blah'] => 'string3' where they could be in any order and be matched to the correct argument name by key?

You'd need to use ReflectionMethod::getParameters() for that. Not a real issue to write something for it, but do take into account this creates some overhead. — Wrikken
– Wrikken, Commented Nov 18, 2014 at 21:56

Wrikken · Accepted Answer · 2015-04-07 10:14:34Z

3

Quite some overhead, but possible:

function callFunction($method, $args) {
    if(method_exists($this, $method)) {
         $arguments = array();
         $reflectionmethod = new ReflectionMethod($this,$method);
         foreach($reflectionmethod->getParameters() as $arg){
             if(isset($args[$arg->name])){
                 $arguments[$arg->name] = $args[$arg->name];
             } else if($arg->isDefaultValueAvailable()){
                 $arguments[$arg->name] = $arg->getDefaultValue();
             } else {
                 $arguments[$arg->name] = null;
             }
         }
         call_user_func_array(array($this, $method), $arguments);
    }
}

function myfunction ($hello, $world, $blah) {
}

Something that is passed by reference would be iffy though. You'd probably need some more code to make that work. Long story short: PHP ain't Python :)

edited Apr 7, 2015 at 10:14

answered Nov 18, 2014 at 22:06

Wrikken

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3 Comments

Uberswe Over a year ago

Thanks, I was hoping there would be a method for this but I figured you may have to do something like this. Good answer!

Daniel Dudas Over a year ago

ReflectionMethod doesn't have a method getArguments. The correct one is $reflectionmethod->getParameters() php.net/manual/ro/reflectionfunctionabstract.getparameters.php

Wrikken Over a year ago

@DaniDudas: thanks for pointing that out (could have sworn I tested it back then, but the manual says otherwise indeed). BTW: you can always suggest an edit, which works a bit quicker.

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