<?php
//In PHP there are no
//Set type, use array instead
$first = [1, 2];
$second = [1, 2];
$third = [1, 2, 3];
$isEqual = $first == $second;
//isEqual is true
$isIntersects = count(array_intersect($first, $third)) > 0;
//isIntersects is true
$isThirdSubsetOfFirst = count(array_filter($third,
function ($var) use ($first) {
return !in_array($var, $first);
})) == 0;
//isSubset is false
echo "isEqual is ", var_dump($isEqual);
echo "isIntersects is ", var_dump($isIntersects);
echo "isThirdSubsetOfFirst is ",
var_dump($isThirdSubsetOfFirst);