How to get unique values ​​in two arrays in php

php method to obtain unique values ​​in two arrays: 1. Use the array_diff() function, the syntax "array_diff(array 1, array 2)"; 2. Use the array_diff_assoc() function, the syntax "array_diff_assoc( Array1,Array2)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In php, get 2 arrays without duplication The value of , that is, comparing two arrays and finding the different elements in the two arrays, that is, the difference set.

Let’s take a look at how to compare two arrays in php, just the difference set.

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

array_diff($arr1,$arr2...) The function only compares the key values ​​of the array and returns a difference array. The elements in the difference array exist in the compared array $arr1, but do not exist in other parameter arrays $arr2 ...middle.

Example:

<?php
$arr1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$arr2=array("a"=>"orange","b"=>"green","e"=>"red","r"=>"yellow");

$result=array_diff($arr1,$arr2);
var_dump($result);
?>

Method 2: Use the array_diff_assoc() function--compare the keys of the array Name and key value

array_diff_assoc($arr1,$arr2...)The function will compare the key name and key value of the array, and also return a difference array. Set elements will be obtained from the compared array $arr1 like array_diff().

Example:

<?php
$arr1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$arr2=array("a"=>"orange","b"=>"green","e"=>"red","r"=>"yellow");

$result=array_diff_assoc($arr1,$arr2);
var_dump($result);
?>

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