How to use array_diff function in php

Usage of array_diff function in php: [array_diff(array)]. The array_diff function is used to compare the key values ​​of arrays between two or more arrays and return an array of differences.

array_diff() is a built-in function in PHP used to calculate the difference between two or more arrays. This function calculates the difference between one or more arrays based on the key values ​​of the elements, and returns the difference as a new array.

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How to use the php array_diff() function?

php The array_diff() function can compare the key values ​​of the arrays between two or more arrays and return the difference. Subtraction basically returns all entries that are present in the first array that are different from the other arrays and do not exist in any other array.

Basic syntax:

array_diff(array1,array2,array3...)

Parameters:

●array1: required, cannot be omitted. The first array to compare with other arrays.

●array2: required and cannot be omitted. The array to compare to the first array.

●array3,... : Optional and can be omitted. Additional array to compare with the first array.

Return value: Returns a difference array that includes everything in the compared array (array1), but not in any other parameter array (array2 or array3, etc.) key value.

Let’s take a look at how to use the php array_diff() function through an example.

Example 1:

<?php
header("content-type:text/html;charset=utf-8");
$class1 = array("西门"=>"55","灭绝"=>"44","无忌"=>"22");
$class2 = array("西门"=>"54","灭绝"=>"44","无忌"=>"25");
print_r(array_diff($class1,$class2 )); //返回两个数组中不一样的元素
?>

Output:

Array ( [西门] => 55 [无忌] => 22 )

Example 2:

<?php
header("content-type:text/html;charset=utf-8");
$per1=array("a"=>"灭绝师太","b"=>"欧阳克","c"=>"西门大官人","d"=>"韦小宝");
$per2=array("e"=>"Peter","f"=>"慕容复","g"=>"陈近南");
$per3=array("a"=>"灭绝师太","b"=>"欧阳克","h"=>"王重阳");
$result=array_diff($per1,$per2,$per3);
print_r($result);
?>

Output:

Array ( [c] => 西门大官人 [d] => 韦小宝 )

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