What is the significance of using count() on the result of array_intersect() in PHP?

When using array_intersect() in PHP to find the common values between two arrays, it is often useful to count the number of common values found. This count can provide valuable information such as the number of matches or whether there are any common elements at all. By using count() on the result of array_intersect(), you can easily determine the number of common values and make decisions based on this information.

$array1 = [1, 2, 3, 4, 5];
$array2 = [3, 4, 5, 6, 7];

$commonValues = array_intersect($array1, $array2);
$numberOfCommonValues = count($commonValues);

echo "Number of common values: " . $numberOfCommonValues;