How to compare the difference between two arrays in php

During development, you may encounter the need to compare the difference between two arrays. So how to use PHP to achieve this? In fact, PHP provides us with such a function: array_diff. Let’s take a look at how to use it.

Commonly used PHP compares the difference between two arrays

array_diff($arr, $arr1);

//比较数组差异 $arr = [1,2,3,4]; $arr1 = [1,2,3]; $diff = array_diff($arr, $arr1); dump($diff); //打印输出如下，函数第二个参数为参数值，没有差异则返回空数组 array(1) { [3] => int(4) }

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