How to merge arrays and remove duplicate values ​​in php

Implementation steps: 1. Use the array_merge() function to merge two or more arrays. The syntax "array_merge(array 1, array 2....)" will return a merged array; 2. Use array_unique The () function can remove duplicate values ​​​​in the merged array, the syntax is "array_unique (merge array)".

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

php merge arrays and merge Methods to remove duplicate values

In PHP, you can use the array_merge() and array_unique() functions to merge arrays and remove duplicate values.

Implementation steps:

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

array_merge( ) function can combine the cells of one or more arrays, that is, append the values ​​in one array to the previous array, and return the combined array.

Note: If two or more array elements have the same key name, the last element will overwrite the other elements.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$a1=array(1,2,6,4,8,0);
$a2=array(6,7,8,0,1);
var_dump($a1);
var_dump($a2);
echo "合并数组：";
$arr=array_merge($a1,$a2);
var_dump($arr);
?>

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

array_unique -- Remove from the array Duplicate values

array_unique($array) accepts $array as input and returns a new array without duplicate values

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$a1=array(1,2,6,4,8,0);
$a2=array(6,7,8,0,1);
echo "合并数组：";
$arr=array_merge($a1,$a2);
var_dump($arr);
echo "合并数组去除重复值：";
$res=array_unique($arr);
var_dump($res);
?>

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