I'm working with a large array. We're displaying all fields of data in the array with a table. Some fields in the array are null because the user hasn't accumulated anything in that field. However, we wanted a zero for when they have such a result. Our solution was to display the value along with intval()
intval(@$users[$user_id]['loggedin_time'])
Which is fine, but it is ugly and inelegant. Is there a way, without a foreach loop, to set all values of '' in the array to be 0?
Yes, with array_map:
$input = array(...);
$output = array_map(function($item) { return $item ?: 0; }, $input);
The above example uses facilities of PHP >= 5.3 (inline anonymous function declaration and the short form of the ternary operator), but you can do the same in any PHP version (only perhaps more verbosely).
You should think a bit about the conditional inside the callback function; the one I 'm using here will replace all values that evaluate to false as booleans with zeroes (this does include the empty string, but it also includes e.g. null values -- so you might want to tweak the condition, depending on your needs).
Update: PHP < 5.3 version
It's either this:
function callback($item) {
return $item == false ? 0 : $item;
}
$output = array_map('callback', $input);
Or this:
$output = array_map(
create_function('$item', 'return $item == false ? 0 : $item;'),
$input);
$item['loggedin_time'].
$input would be $users[$user_id].$users array upfront, but as he's already iterating over that somehow, he might as well just call array_map once per iteration (per your solution).I assume you are retrieving this information from a database of some sort.
If you are getting the array from a Mysql Table try something like this: http://forums.mysql.com/read.php?20,36579,36579#msg-36579
