Does PHP\'s `array_intersect()` Effectively Identify Overlapping Elements in Two Arrays?

Finding Intersecting Elements in Flat Arrays

When dealing with flat arrays, determining whether any of their elements coincide can be a common task. This question explores a PHP code solution for such a scenario.

The goal is to verify if any elements in a "People" array exist within a "Wanted Criminals" array. For instance, if the "People" array contains the values [3, 20], while the "Wanted Criminals" array consists of [2, 4, 8, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20], the desired outcome would be true, as "20" appears in both arrays.

Solution: Utilizing Array Intersection

PHP's array_intersect() function provides a straightforward solution for finding the intersection of two arrays. It returns an array containing the elements that are common to both input arrays. To determine if any "People" elements appear in the "Wanted Criminals" array, we can evaluate the resulting intersection array using the !empty() function.

Here's the code snippet demonstrating this approach:

$people = [3, 20];
$criminals = [2, 4, 8, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20];

$peopleContainsCriminal = !empty(array_intersect($people, $criminals));

if ($peopleContainsCriminal) {
  echo "Yes, there is an element in the People array that appears in the Wanted Criminals array.";
} else {
  echo "No, none of the elements in the People array appear in the Wanted Criminals array.";
}

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