How to use array_intersect function in php

Usage of array_intersect function in php: [array_intersect(array1)]. The array_intersect function is used to compare the key values ​​of two or more arrays and return the intersection array.

array_intersect() function is a built-in function provided by PHP. The syntax is array_intersect(array1,array2,array3...), which is used to calculate two or The intersection of multiple arrays. This function is used to compare the key values ​​of two or more arrays and return the intersection.

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How to use the php array_intersect() function?

php The array_intersect() function is used to compare the key values ​​of two (or more) arrays and return the intersection.

Basic syntax:

array_intersect(array1,array2,array3...)

Parameters:

●array1: required, cannot be omitted. The first array to compare with other arrays.

●array2: required and cannot be omitted. The array to compare to the first array.

●array3,...: Optional and can be omitted. Additional array to compare with the first array.

Return value: Returns an intersection array that includes all the arrays being compared (array1), and also in any other parameter arrays (array2 or array3, etc.) key value.

Let’s take a look at how to use the php array_intersect() function through an example.

<?php
header("content-type:text/html;charset=utf-8");
$a1=array("郭靖"=>"降龙十八掌","黄蓉"=>"打狗棍法","西门"=>"吹雪剑法","过儿"=>"黯然销魂掌");
$a2=array("黄蓉"=>"打狗棍法","小龙女"=>"玉女心经","金轮法王"=>"龙象般若功");
$a3=array("裘千仞"=>"九阴白骨爪","天山童姥"=>"天山传音","黄蓉"=>"打狗棍法");
$result=array_intersect($a1,$a2,$a3); //返回三个数组中都存在的元素
print_r($result);
?>

Output:

Array ( [黄蓉] => 打狗棍法

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