How Can I Efficiently Check for Overlapping Elements Between Two PHP Arrays?

Verifying Overlap in Array Elements

In PHP, we encounter situations where it's necessary to determine whether any elements from one array are present in another. Consider the following arrays:

People:

$people = [3, 20];

Wanted Criminals:

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

Our objective is to ascertain if any individuals from the "People" array are also included in the "Wanted Criminals" lineup.

Solution: array_intersect()

PHP's array_intersect() function proves useful in this scenario. It compares two arrays and returns an array containing the elements that appear in both. If the resulting array is not empty, it signifies at least one shared element.

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

In this example, $isPresent will be set to true because the value '20' is present in both arrays.

Additional Notes:

• The !empty() check ensures a non-zero element count in the intersected array before determining overlap.
• If we wished to check specifically for the absence of overlaps, we could use empty(array_intersect($people, $criminals)).

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