How to find different elements in two arrays in php

Two methods: 1. Use the array_diff() function, the syntax is "array_diff(array 1, array 2)"; 2. Use the array_diff_assoc() function to compare the key names and key values ​​of the two arrays and return the difference. Set, syntax "array_diff_assoc(array1,array)".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

Get two arrays Different elements (difference set) in

1. Use array_diff() function

array_diff() function returns the difference set of two arrays array. This array contains all keys that are in the array being compared, but are not in any of the other argument arrays.

In the returned array, the key names remain unchanged.

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"green","g"=>"blue");

$result=array_diff($a1,$a2);
print_r($result);
?>
//
Array ( [d] => yellow )

2. Use the array_diff_assoc() function

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

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("a"=>"red","b"=>"green","c"=>"blue");

$result=array_diff_assoc($a1,$a2);
print_r($result);
//
Array ( [d] => yellow )

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