349. Intersection of Two Arrays

intersection.ts

function intersection(nums1: number[], nums2: number[]): number[] {
    
    const nums1Set = new Set(nums1);
    const nums2Set = new Set(nums2);

    const result: number[] = [];

    for(const num of nums1Set) {
        if(nums2Set.has(num)) {
            result.push(num);
        }
    }

    return result;
};

Solution.php

class Solution {

    /**
     * @param Integer[] $nums1
     * @param Integer[] $nums2
     * @return Integer[]
     */
    function intersection($nums1, $nums2) {
        
       $nums1_unique = array_unique($nums1);
       $nums2_map = array_flip(array_unique($nums2)); 
        
        $result = [];
       foreach($nums1_unique as $num) {
            if(isset($nums2_map[$num])) {
                $result[] = $num;
            }
       }

       return $result;
    }
}