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How to determine whether two arrays intersect in PHP

青灯夜游
Release: 2023-03-16 15:22:01
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Judgment steps: 1. Use the array_intersect_assoc() function to compare the key names and key values ​​of the two arrays. The syntax "array_intersect_assoc (array 1, array 2)" will return an intersection array; 2. Use "== The =” operator determines whether the intersection array is empty. The syntax is “intersection array ===[]”. If the intersection array is empty, the two arrays have no intersection. If the intersection array is not empty, the two arrays have intersection.

How to determine whether two arrays intersect in PHP

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

In php, you can use the array_intersect_assoc() function and "===" operator to determine whether the two arrays have intersection.

Implementation steps:

Step 1: Use the array_intersect_assoc() function to compare arrays and find the intersection of the two arrays

array_intersect_assoc The () function is used to compare the key names and key values ​​of two (or more) arrays and return an array containing the intersection elements (an intersection array).

$result=array_intersect_assoc($a1,$a2);
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Step 2: Use the "===" operator to determine whether the intersection array is empty

$result===[]
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If the intersection array is empty, the two arrays have no intersection. If the intersection If the array is not empty, the two arrays have intersection.

Complete sample code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
function f($a1,$a2){
	$result=array_intersect_assoc($a1,$a2);
	var_dump($result);
	if($result===[]){
		echo &#39;两数组没有交集&#39;;
	}else{
		echo &#39;两数组有交集&#39;;
	}
}


$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("a"=>"red","b"=>"green","c"=>"blue");
$a3=array("a"=>"1","b"=>"2","d"=>"blue");
var_dump($a1);
var_dump($a2);
echo &#39;$a1 和 $a2对比:&#39;;
f($a1,$a2);
echo &#39;<hr>&#39;;

var_dump($a2);
var_dump($a3);
echo &#39;$a2 和 $a3对比:&#39;;
f($a2,$a3);
?>
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How to determine whether two arrays intersect in PHP

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