How to get different values ​​from two arrays in php

3 ways to get different values: 1. Compare the array key values ​​and return a difference array containing different values, the syntax is "array_diff(array 1, array 2)". 2. Compare the array key names and return a difference array containing different values. The syntax is "array_diff_key(array 1, array 2)". 3. Compare the key names and key values ​​of the array, and return a difference array containing different values. The syntax is "array_diff_assoc(array 1, array 2)".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php obtains different values ​​​​from two arrays, which is comparison Two arrays, get the difference set.

There are three situations in PHP comparing arrays: comparing only key values, comparing only key names, and comparing key values ​​and key names. Corresponding to three built-in functions:

• array_diff()

• array_diff_key()

• array_diff_assoc ()

Let’s learn about it through examples:

1. Use the array_diff() function--compare the key values ​​of the array

array_diff() function is used to compare the values ​​of two (or more) arrays and return the difference.

array_diff(array1,array2,array3...);

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 or array3, etc.).

<?php
header("Content-type:text/html;charset=utf-8");
$arr1=array(1,2,3,4,5,6);
$arr2=array(2,4,6,8,10,12);
var_dump($arr1);
var_dump($arr2);

echo "两个数组的不同值：";
$result=array_diff($arr1,$arr2);
var_dump($result);
?>

2. Use the array_diff_key() function to compare the key names of arrays

array_diff_key() function is used to compare two Key names of (or more) arrays and return the difference set.

array_diff_key(array1,array2,array3...);

This function compares the key names of two (or more) arrays and returns a difference array that includes everything in the compared array (array1) but not in any other parameters The key name in the array (array2 or array3, etc.).

<?php
header("Content-type:text/html;charset=utf-8");
$arr1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$arr2=array("a"=>"orange","b"=>"green","e"=>"red","r"=>"yellow");
var_dump($arr1);
var_dump($arr2);

echo "两个数组的不同值：";
$result=array_diff_key($arr1,$arr2);
var_dump($result);
?>

In the above example, there are two key names in the $arr1 array and the $arr2 array that are different. Based on the array $arr1, the value ""c"=>" blue"" and ""d"=>"yellow"", so the output result is:

3 , use the array_diff_assoc() function - compare the key names and key values ​​of the array

array_diff_assoc() function is used to compare the key names and key values ​​of two (or more) arrays, and return the difference set .

array_diff_assoc(array1,array2,array3...);

This function compares the key names and key values ​​​​of two (or more) arrays, and returns a difference array, which includes everything in the compared array (array1), but not in any Key names and key values ​​in other parameter arrays (array2 or array3, etc.).

<?php
header("Content-type:text/html;charset=utf-8");
$arr1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$arr2=array("a"=>"orange","b"=>"green","e"=>"red","r"=>"yellow");
var_dump($arr1);
var_dump($arr2);

echo "两个数组的不同值：";
$result=array_diff_assoc($arr1,$arr2);
var_dump($result);
?>

In the above example, the $arr1 array and the $arr2 array are compared. There are three different elements, and then the value ""a"=>"red will be obtained based on the array $arr1. "", ""c"=>"blue"", ""d"=>"yellow"", so the output result is:

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