How to find the intersection of two arrays in PHP

In PHP, you can use the built-in function array_intersect() to find the intersection of two arrays, which can return the common elements (intersection part) of the two arrays. Let’s introduce it in detail below.

##array_intersect() function

Basic syntax:

array_intersect（$ array1，$ array2）

Description: The The function returns an array containing all the values ​​of array1 present in array2.

Note: Since the array_intersect() function takes an array with reserved keys, we also need to use the array_values() function to reorder the keys.

Simple example

Let’s take a look at the array_intersect() function’s method of finding the intersection of two arrays through an example

<?php 
// 定义两个数组
$array1 = array(2, 5, 7, 6, 9); 
$array2 = array(3, 2, 5, 6, 8); 
  
// 找到两个数组的交集
$result = array_intersect($array1, $array2); 
  
// 重新索引
$result = array_values($result); 
  
// 输出结果数组（交集）
var_dump($result); 
?>

Output:

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