PHP获得两个对象数组的差

问题描述

我知道有array_diff和array_udiff用于比较两个数组之间的差异，但是我将如何使用两个对象数组进行比较?

I know there is array_diff and array_udiff for comparing the difference between two arrays, but how would I do it with two arrays of objects?

array(4) {
    [0]=>
        object(stdClass)#32 (9) {
            ["id"]=>
            string(3) "205"
            ["day_id"]=>
            string(2) "12"
        }
}

我的数组就像这样，我很想看看基于ID的两个数组的区别.

My arrays are like this one, I am interested to see the difference of two arrays based on IDs.

推荐答案

这正是 array_udiff 的用途.编写一个函数，以您希望的方式比较两个对象，然后告诉array_udiff使用该函数.像这样:

This is exactly what array_udiff is for. Write a function that compares two objects the way you would like, then tell array_udiff to use that function. Something like this:

function compare_objects($obj_a, $obj_b) {
  return $obj_a->id - $obj_b->id;
}

$diff = array_udiff($first_array, $second_array, 'compare_objects');

或者，如果您使用的是PHP> = 5.3，则可以使用匿名函数而不是声明函数:

Or, if you're using PHP >= 5.3 you can just use an anonymous function instead of declaring a function:

$diff = array_udiff($first_array, $second_array,
  function ($obj_a, $obj_b) {
    return $obj_a->id - $obj_b->id;
  }
);

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