Question

all

I have a bundle of data like 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

then I separate these data into 2 groups which is

$groupA = range(1, 5)

$groupB = range(6, 10)

For instance, I have $data = array(1, 4) and it will return this belong to Group A. Likewise,
$data = array(7,8), it will return to me Group B.

So how can I write a script to let $data = array(1, 4, 6, 7) return me Group A and Group B?

Thank you

Answer 1

You may want to use array_intersect:

$groupA = range(1, 5);
$groupB = range(6, 10);
$data = array(1, 4, 6, 7);
$foundGroups = array();
if(array_intersect($data, $groupA))
    $foundGroups[] = 'A';
if(array_intersect($data, $groupB))
    $foundGroups[] = 'B';
print_r($foundGroups);

Note that an empty array evaluates to false while one with at least one element evaluates to true.

Warning: If you have to work with a lot of groups with many elements you may want to use a manual approach and stop at the first common element found. array_intersect finds all the common elements and you don’t really need that.