How to check if the values ​​in an array are not equal to each other in php

Method: 1. Use "array_unique(array)" to remove duplicate values ​​in the original array, which will return a deduplicated array; 2. Use count() to obtain the length of the original array and the length of the deduplicated array. Syntax "count(array)"; 3. Compare whether the two lengths are equal. If they are equal, the values ​​in the array are not equal to each other. Otherwise, there are equal values.

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

php checks that the values ​​in the array are not mutually exclusive Equality is to check whether the elements in the array have duplicate values; if there are duplicate values, the array elements are not equal to each other.

So how to determine whether the elements in the array have duplicate values?

Implementation method:

• Use array_unique() to remove duplicate values ​​in the original array and return the deduplicated array

• Use count() to obtain the length of the original array and the length of the deduplication array respectively

• Compare whether the length of the original array and the length of the deduplication array are equal

  • If they are equal, it means there are no duplicate values, that is, the values ​​in the original array are not equal to each other

  • If they are not equal, it means there are duplicate values, that is, the values ​​in the original array are not equal to each other. There are equal values ​​in the array.

Implementation example:

Judge whether the values ​​in the following arrays are not equal to each other

$arr1=array(2,3,5,32,1,2,4);
$arr2=array(3,4,5,6,7,8,9,1,2);

Code ：

<?php
header("Content-type:text/html;charset=utf-8");
function f($arr){
	$len1=count($arr);
	$unique=array_unique($arr);
	$len2=count($unique);
	if($len1==$len2){
		echo "数组中值互不相等<br>";
	}else{
		echo "数组中有相等的值<br>";
	}
}
$arr1=array(2,3,5,32,1,2,4);
$arr2=array(3,4,5,6,7,8,9,1,2);
f($arr1);
f($arr2);
?>

It can be seen that there are equal values ​​in the $arr1 array, but the values ​​in the $arr2 array are not equal to each other.

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