How to implement array intersection using the array_intersection() function in PHP8

With the release of PHP8, it brings many powerful new features and improvements. One worth mentioning is the array_intersection() function. This function allows you to intersect two or more arrays, i.e. find the elements that are the same between them. In this article, we'll take a closer look at this new function and provide some examples of using it.

1. array_intersection() function overview

array_intersection() function accepts two or more arrays as parameters and returns an array containing the same elements in two or more arrays new array. This function is very similar to the array_intersect() function, but using the array_intersect() function requires manually listing all arrays as parameters, while the array_intersection() function can accept any number of arrays.

The following is the syntax of the array_intersection() function:

array_intersection ( array $array1 , array $array2 [, array $... ] ) : array

The function accepts one or more array parameters and returns a new array representing the intersection between all arrays.

2. array_intersection() function example

Now let’s see how to use the array_intersection() function in practice. Here are a few examples:

Example 1: Find the intersection between two arrays

$array1 = array(1, 2, 3, 4, 5);
$array2 = array(3, 4, 5, 6, 7);
$result = array_intersection($array1, $array2);
print_r($result);

Output:

Array ( [2] => 3 [3] => 4 [4] => 5 )

In the above example, we have two arrays , $array1 and $array2. We use the array_intersection() function to find the intersection between these two arrays and store the result in a new array called $result. Finally, we use the print_r() function to print out the intersection result.

Example 2: Find the intersection between multiple arrays

$array1 = array(1, 2, 3, 4, 5);
$array2 = array(3, 4, 5, 6, 7);
$array3 = array(5, 6, 7, 8, 9);
$result = array_intersection($array1, $array2, $array3);
print_r($result);

Output:

Array ( [3] => 5 )

In this example, we have three arrays, $array1, $array2 and $ array3. We use the array_intersection() function to find the intersection between these arrays and store the result in a new array called $result. Finally, we use the print_r() function to print out the intersection result.

3. Conclusion

In this article, we introduced the array_intersection() function in PHP8 and how to use it to implement array intersection. This new function greatly simplifies the code and is very easy to use. If you need to find the intersection between two or more arrays while writing PHP code, consider using the array_intersection() function, you will find it a very useful tool.

The above is the detailed content of How to implement array intersection using the array_intersection() function in PHP8. For more information, please follow other related articles on the PHP Chinese website!