How to remove duplicate values ​​from two arrays in php

Removal steps: 1. Use array_intersect() to obtain duplicate values ​​(intersection elements) of two arrays. The syntax "array_intersect(original array 1, (original array 2)" will return an intersection array; 2. Use array_diff() to compare the two original arrays and the intersection array respectively to obtain the difference set, that is, delete duplicate values ​​and obtain non-duplicate elements. The syntax is "array_diff (original array 1, intersection array)" and "array_diff (original array 2) , intersection array)".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

How to remove two Duplicate values ​​that exist in both arrays, that is, intersection elements?

Example: There are two arrays like this:

$arr1=array(1,2,3,4,5,6,7,8,9);
$arr2=array(2,4,6,8,10,12,14,16);

The duplicate values ​​that exist in both arrays are:

2、4、6、8

How to remove these duplicate values?

In PHP, you can use the array_intersect() and array_diff() functions to delete duplicate values ​​from two arrays.

Implementation steps:

Step 1: Use array_intersect() function to obtain repeated values ​​(intersection elements) of two arrays

array_intersect() function can be compared The values ​​of the two arrays and return the intersection array containing duplicate values.

$intersect=array_intersect($arr1,$arr2);
var_dump($intersect);

Step 2: Use the array_diff() function to remove duplicate values ​​from the two arrays ( Intersection elements)

Use the array_diff() function to compare the two arrays and the intersection array respectively to obtain the difference set (remove duplicate values ​​and obtain non-duplicate elements).

$diff1=array_diff($arr1,$intersect);
$diff2=array_diff($arr2,$intersect);
echo "删除交集元素后的两数组：";
var_dump($diff1);
var_dump($diff2);

Compare:

Description:

array_diff() function is used Compares the values ​​of two (or more) arrays and returns the difference.

This function compares the values ​​of two (or more) arrays (value in key=>value), and Returns a difference array that includes all values ​​in the compared array (array1) but not in any other parameter array (array2).

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