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

This built-in function of PHParray_intersect_key()is used to calculate the intersection of two or more arrays. This function differs fromarray_intersect()andarray_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 thearray_intersect_key()function. In the following program example, we usearray_intersect_key()to find the intersection between arrays.

 "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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