adding element to array - php

Question

I have an array that looks like this:
array
0 =>
array
'title' => string 'Ireland - Wikipedia, the free encyclopedia'
'url' => string 'http://en.wikipedia.org/wiki/Ireland'
1 =>
array
'title' => string 'Ireland's home for accommodation, activities.'
'url' => string 'http://www.ireland.com/'
that I want to add a score of 0 to each element. I thought this simple foreach loop would do the trick but...well....it doesn't :/
public function setScore($result)
{
foreach($result as $key)
{
$key = array('title', 'url', 'score' => 0);
}
return $result;
}
Can someone help me out?
Thanks

Answer 1

foreach works on a copy of the array. You can modify $key all you want, it's not going to reflect on the original array.
You can use $key by reference though, then it'll work as expected:
foreach ($result as &$value) {
$value['score'] = 0;
}
Manual entry: http://php.net/manual/en/control-structures.foreach.php

Answer 2

You create a new array here and do nothing with it:
foreach($result as $key){
$key = array('title', 'url', 'score' => 0);
}
What you want to do is to modify a reference to existing one:
foreach($result as &$key){ # Note the '&' here
$key['score'] = 0;
}

Answer 3

Although deceze is right, you can also do this using array_walk(), like this:
array_walk( $result, function( &$el) { $el['score'] = 0; });

Answer 4

Here's an example of how to accomplish this.
$array = array( array( 'title' => "Ireland - Wikipedia, the free encyclopedia", 'url' => "http://en.wikipedia.org/wiki/Ireland"), array( 'title' => "Ireland's home for accommodation, activities.", 'url' => "http://www.ireland.com/" ) );
function setScore( $result )
{
foreach( $result as &$element )
{
$element['score'] = 0;
}
return $result;
}
$array = setScore( $array );
print_r( $array );
You could also do:
function setScore( &$result )
{...}
and then just:
setScore( $array );