How to perform union sum in php array

Implementation steps: 1. Use array_merge() to merge multiple arrays into one array, the syntax is "array_merge(array 1, array 2...)"; 2. Use array_unique() to remove the elements in the merged array For repeated values, the syntax "array_unique (merge array)" will return a union array; 3. Use the array_sum() function to calculate the sum of the union arrays, the syntax "array_sum (union array)".

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

Array union is to combine two or more The collection after array merging and deduplication.

In PHP arrays, you can use the array_merge() function, array_unique() function and array_sum() function to perform union summation.

Implementation idea:

• First merge the arrays and find the union of two or more arrays

• Then sum the unions

Implementation steps:

Step 1 : Use the array_merge() function to merge arrays

array_merge() function will merge the elements of multiple arrays, and the elements of the next array will be appended to the previous array, and finally return the merged array.

Note: If the original array has the same string key name, then the value after the key name will overwrite the previous value; if the original array contains a numeric key name, then the later value will The previous value is not overwritten, but appended to it.

Example: Merge 3 arrays

<?php
header("Content-type:text/html;charset=utf-8");
$arr1 = [1,2,3,4,5];
$arr2 = [2,3,6,7,8,9];
$arr3 = [10];
var_dump($arr1);
var_dump($arr2);
var_dump($arr3);
$result = array_merge($arr1,$arr2,$arr3);
echo "合并数组后：";
var_dump($result);
?>

Step 2: Use the array_unique() function to remove duplicate values ​​from the merged array to obtain the array Union

array_unique() function can remove duplicate values ​​from the array

$bj=array_unique($result);
echo "并集数组：";
var_dump($bj);

Step 3: Use array_sum() function to calculate the union The sum of arrays

array_sum() function can calculate the sum of all elements in an array.

$sum=array_sum($bj);
echo "并集之和：".$sum;

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