How to compare array values ​​in php

Two comparison methods: 1. Use the array_diff() function to compare the differences in array values. This function can compare the key values ​​​​of one or more arrays and return different elements. The syntax "array_diff($arr1,$arr2 ...)"; 2. Use the array_diff_assoc() function to compare the differences in array values. This function can compare the key names and key values ​​of one or more arrays and return different elements. The syntax is "array_diff_assoc($arr1,$arr2... )".

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

In PHP, you can use the following functions to compare array values The difference

• array_diff() function

• array_diff_assoc() function

method 1. array_diff() function - compares the key values ​​of the array

array_diff() function only compares the key values ​​of the array

array_diff($arr1,$arr2...)

This function will return a difference array, difference set The elements in the array exist in the compared array $arr1, but do not exist in other parameter arrays $arr2...

Example: Return different elements of the array

<?php
header("Content-type:text/html;charset=utf-8");
$arr1=array(1,2,3,4,5,6,7,8,9,10);
$arr2=array(2,4,6,8,10);
var_dump($arr1);
var_dump($arr2);
$result=array_diff($arr1,$arr2);
echo "两个数组中，不同的元素为：";
var_dump($result);
?>

Method 2, array_diff_assoc() function--Compare the key name and key value of the array

array_diff_assoc() function will compare the key name and key value of the array

array_diff_assoc($arr1,$arr2...)

This function will return a difference set array, and the difference set elements are the same as array_diff() and array_diff_key() It will be obtained from the compared array $arr1.

Example: Return different elements of the array

<?php
header("Content-type:text/html;charset=utf-8");
$arr1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$arr2=array("a"=>"orange","b"=>"green","c"=>"red","d"=>"yellow");
var_dump($arr1);
var_dump($arr2);
$result=array_diff_assoc($arr1,$arr2);
echo "两个数组中，不同的元素为：";
var_dump($result);
?>

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