How to get the number of different elements in two arrays in php

Obtaining steps: 1. Use the array_diff() function to compare two arrays, which will return a difference array containing different elements. The syntax is "array_diff(array 1, array 2)"; 2. Use count() The function counts the number of elements in the difference array, and the syntax is "count(difference array)".

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

php Get two The number of different elements in the array

In PHP, you can use the array_diff() and count() functions to get the number of different elements in the two arrays.

Step 1: Use the array_diff() function to compare arrays and return the difference between the two arrays

The array_diff() function compares the key values ​​of the array and returns a value containing Difference array of different elements

<?php
header("Content-type:text/html;charset=utf-8");
$arr1=array(1,2,3,4,5,6);
$arr2=array(1,2,4,6,8,9);
var_dump($arr1);
var_dump($arr2);
echo "差集数组：";
$result=array_diff($arr1,$arr2);
var_dump($result);
?>

Step 2: Use the count() function to count the number of elements in the difference array

## The #count() function can count the number of all elements in an array.

<?php
header("Content-type:text/html;charset=utf-8");
$arr1=array(1,2,3,4,5,6);
$arr2=array(1,2,4,6,8,9);
var_dump($arr1);
var_dump($arr2);
echo "差集数组：";
$result=array_diff($arr1,$arr2);
var_dump($result);
$len=count($result);
echo "不同元素的个数为：".$len;
?>

Description:

array_diff() function is used to compare two (or more ) value of the array and returns the difference set.

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

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