How to compare arrays in php and obtain different elements

Method: 1. Use array_diff() to compare based on the array key value, the syntax is "array_diff(array 1, array 2)"; 2. Use array_diff_assoc() to compare based on the array "key/value pair", Syntax "array_diff_assoc(array1,array2)".

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

Method 1: Use 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 will return a difference array. The elements in the set array exist in the compared array $arr1, but do not exist in other parameter arrays $arr2....

Example:

<?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);
$result=array_diff($arr1,$arr2);
echo "两个数组中，不同的元素为：";
var_dump($result);
?>

Output result:

Method 2: Use array_diff_assoc() function --Compare the key names and key values ​​of the array

array_diff_assoc($arr1,$arr2...)The function will compare the key names and key values ​​of the array and return the same A difference array, the difference elements will be obtained from the compared array $arr1 just like array_diff().

<?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);

$result=array_diff_assoc($arr1,$arr2);
echo "两个数组中，不同的元素为：";
var_dump($result);
?>

Output result:

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