How to compare two arrays in php and remove identical elements

Implementation steps: 1. Use array_intersect() to compare two arrays and obtain the same elements. The syntax "array_intersect(original array 1, original array 2)" will return an intersection array containing the same elements; 2. Use array_diff() to compare the two original arrays and the intersection array respectively, delete the same elements, and obtain different elements. The syntax is "array_diff (original array 1, intersection array)" and "array_diff (original array 2, intersection array)" .

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

In php, you can use array_intersect () and array_diff() functions to compare two arrays and remove identical elements

Implementation steps:

Step 1: Use array_intersect() function to compare Two arrays and get the same elements

array_intersect() function can compare the values ​​of two arrays and return the intersection array containing the same elements.

array_intersect(array1,array2);

Parameters	Description
array1	Required . The first array to compare with other arrays.
array2	Required. The array to compare to the first array.

Return value: Returns the intersection array, which includes all keys in the compared array (array1) and in any other parameter array (array2) value.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr1=array(1,2,3,4,5,6);
$arr2=array(2,4,6,8,10,12);
var_dump($arr1);
var_dump($arr2);
$intersect=array_intersect($arr1,$arr2);
echo "相同元素有：";
var_dump($intersect);
?>

Step 2: Use the array_diff() function to delete the same elements of the two arrays

Use the array_diff() function to delete the same elements respectively Compare the two arrays with the intersection array to obtain the difference set (delete the same elements and obtain different elements).

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

array_diff(array1,array2,);

Parameters	Description
array1	Required . The first array to compare with other arrays.
array2	Required. The array to compare to the first array.
array3,...	Optional. Additional array to compare with the first array.

array_diff() function compares the values ​​​​of two (or more) arrays (value in key=>value) and returns a difference array. The array contains all values ​​that are in the array being compared (array1) but not in any of the other argument arrays (array2).

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr1=array(1,2,3,4,5,6);
$arr2=array(2,4,6,8,10,12);
var_dump($arr1);
var_dump($arr2);
$intersect=array_intersect($arr1,$arr2);
echo "相同元素有：";
var_dump($intersect);

$diff1=array_diff($arr1,$intersect);
$diff2=array_diff($arr2,$intersect);
echo "删除相同元素后的两数组：";
var_dump($diff1);
var_dump($diff2);
?>

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