What are some common pitfalls when trying to find the intersection of two arrays in PHP?

One common pitfall when trying to find the intersection of two arrays in PHP is not using the correct function to perform the intersection operation. The `array_intersect()` function should be used to find the intersection of two arrays in PHP. Another pitfall is not ensuring that the arrays being compared are properly formatted and contain the expected data.

// Example of finding the intersection of two arrays in PHP
$array1 = [1, 2, 3, 4, 5];
$array2 = [3, 4, 5, 6, 7];

$intersection = array_intersect($array1, $array2);

print_r($intersection);