How to determine how many values ​​in two arrays are the same in php

Method: 1. Use array_intersect() to compare arrays, the syntax "array_intersect(array 1, array 2)" will return an intersection array; 2. Use count() to get the length of the intersection array, the syntax "count (array)", the length of the returned array is the number of elements with the same value.

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

php determines two arrays There are several methods with the same values

1. Use the array_intersect() function to compare two arrays and obtain the intersection elements

array_intersect() function Used to compare the values ​​of two (or more) arrays and return an intersection array.

<?php
header("Content-type:text/html;charset=utf-8");
$arr1=array(32,1,3,6,8,34,12,7);
$arr2=array(1,8,3,12,5,32,7,8);
var_dump($arr1);
var_dump($arr2);
$intersect=array_intersect($arr1,$arr2);
echo "两个数组的交集：";
var_dump($intersect);
?>

It can be seen that the returned intersection array contains elements with the same value in both arrays.

You only need to calculate the length of the intersection array to know how many values ​​in the two arrays are the same.

2. Use count() to get the length of the intersection array

The count() function can count the number of all elements in the array, or the number of attributes in the object. .

$len=count($intersect);
echo "两数组中值相同的元素有： ".$len." 个";

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