PHP - Pull ids from a string and convert to array

I'm working on a linking system and the UI will post a hidden string below

"artwork:56,artwork:34,music:123"

This will represent linking the following media:

• Artwork ID:56
• Artwork ID: 34
• Music ID:123

What I'm trying to figure out is how to feed in the string above and spit out the id's I need.

function getArtworkIds($string){
     //Code Needed
}

Results [56,34]

Any help would be awesome, Thank you

Answer:

$string  = "artwork:56,artwork:34,music:123";

$a = explode(',',$string);
$ids = array();
foreach($a as $i){
  if(strpos($i,"art") !== false){
    $ids[] = explode(':',$i)[1];
  }
}
var_dump($ids);

Output: 56,34

the !== false is important, as strpos will return 0 since the string starts with art. Without the !== false check you'd get no results because the if would treat the 0 as a boolean false