// Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.
function containsDuplicate($nums) {
$nums = array_count_values($nums);
foreach ($nums as $key => $num) {
if ($num >= 2) {
return true;
}
}
return false;
}
echo containsDuplicate([1, 2, 3, 1]); by Luka Khitaridze
2 years ago