Find Intersection Algorithm Using PHP

Have the function FindIntersection(strArr) read the array of strings stored in strArr which will contain 2 elements: the first element will represent a list of comma-separated numbers sorted in ascending order, the second element will represent a second list of comma-separated numbers (also sorted). Your goal is to return a comma-separated string containing the numbers that occur in elements of strArr in sorted order. If there is no intersection, return the string false.

<?php
function FindIntersection($strArr) {
  $array1 = explode(", ", $strArr[0]);
  $array2 = explode(", ", $strArr[1]);
  $intersect = [];
    foreach ($array1 as $data) {
     
        if (in_array($data, $array2)) {
            $intersect[] = $data;
         }
     }
    return (empty($intersect)) ? "false" : implode(",", $intersect);
  return $strArr;
}
// echo the function call here
echo FindIntersection();
?>
output logs will look like this:
1,4,13

The explode function is used to “Split a string into pieces of elements to form an array”, in simple term, it breaks a string into an array.