How to calculate the intersection between multiple arrays in PHP? (code example)

This built-in function of PHP array_intersect_key() is used to calculate the intersection of two or more arrays. This function differs from array_intersect() and array_intersect_assoc() in that it uses keys for comparison and returns the matching key element. This function prints only the elements of the first array whose key values ​​match the elements of all other arrays. (Recommended: "PHP Tutorial")

Syntax:

array array_intersect_key($array1, $array2, $array3, $array4...)

Parameters: array_intersect_key() The function accepts at least two array as parameter. It can take any number of arrays, greater than or equal to two arrays separated by commas (', ').

Return type: The function returns another array containing the elements of the first array that are present as parameters in all other arrays, whose key values ​​match each other. If there are no matching keys, an empty array is returned.

Example:

输入: $array1 = ("1" => "aakash", "2" => "rishav", "3" => "gaurav")
        $array2 = ("1" => "shyam", "2" => "rishi", "5" => "rishav")
        $array3 = ("1" => "aakash", "4" => "raghav", "2" => "ravi")
输出:
        Array
        (
          [1] => aakash
          [2] => rishav
        )

The following program demonstrates the array_intersect_key() function. In the following program example, we use array_intersect_key() to find the intersection between arrays.

<?php 
   
$array1 = array("1" => "aakash", "2" => "rishav", "3" => "gaurav"); 
$array2 = array("1" => "shyam", "2" => "rishi", "5" => "rishav"); 
$array3 = array("1" => "aakash", "4" => "raghav", "2" => "ravi"); 
  
print_r(array_intersect_key($array1, $array2, $array3));

Output:

Array
(
    [1] => aakash
    [2] => rishav
)

This article is an introduction to the method of calculating the intersection between multiple arrays in PHP. It is simple and easy to understand. I hope it will be helpful to friends in need!

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