Question

Many languages have a “Set” data structure which typically only contain unique values from a particular collection of objects. For instance, if you add the integers 1, 4, 5, 1, 2, and 6 to the set, in the end the set would actually only contain 1, 4, 5, 2 and 6.

I haven’t observed any kind of collection like this in PHP. Is there such a collection built into the language, or does something need to be custom rolled?

Answer 1

Doubt there is anything built in, but it’s very simple to achieve:

<?

$set = array(1, 4, 5, 1, 2, 6); // original set
$set = array_unique($set);
//$set = array_values($set); // add this to reset the keys
print_r($set); // returns 1, 4, 5, 2 and 6.