CODEWITHSUNDEEP
php
Martyn Ball
Martyn Ball

Reputation: 4895

PHP send additional (optional) arguments through function arguments

Let's say I want to send the effect through a function argument, can I also send the additional arguments through that as well, can't really explain it, here is how I would imagine it. 

<?php
//Apply photo effects
function applyEffect($url,$effect) {
    //List valid effects first


    $img = imagecreatefromjpeg($url);

    //Testing
    if($img && imagefilter($img, $effect)) {
        header('Content-Type: image/jpeg');
        imagejpeg($img);

        imagedestroy($img); 
    } else {
        return false;
    }
}

applyEffect("http://localhost:1234/ppa/data/images/18112013/0/image3.jpg",IMG_FILTER_BRIGHTNESS[20]);
?>

As you can see I pass IMG_FILTER_BRIGHTNESS through the function arguments, but the filter i'm using needs an additional argument which it would be nice to send when I call the applyEffect function, like so: IMG_FILTER_BRIGHTNESS[20]

But this does not work, any pointers?

Upvotes: 1

Views: 62

Answers (1)

m59
m59

Reputation: 43795

It sounds like you would like func_get_args and then you could create the arguments for the next function call from that and use it like call_user_func_array(theFunction, $args).

function applyEffect($url, $effect, $vals) {
  $img = makeImage($url);

  //get an array of arguments passed in
  $args = func_get_args();

  //update the first item with the changed value
  $args[0] = $img;

  //get rid of the 3rd item, we're about to add on its contents directly to $args array
  unset($args[2]);

  //add all the optional arguments to the end of the $args array
  $args = array_merge($args, $vals);

  //pass the new args argument to the function call
  call_user_func_array(imagefilter, $args);
}

applyEffect('foo.jpg', 'DO_STUFF', array(20,40,90));


function imageFilter() {
  $args = func_get_args();
  foreach ($args as $arg) {
    echo $arg.'<br>';
  }
}

function makeImage($url) {
  return "This is an image.";
}

You can also set default argument values on functions like this:

function foo($arg1, $arg2=null, $arg3=null) { }

Upvotes: 2

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