php PHP获取两个对象数组的差异
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PHP get difference of two arrays of objects
提问by roflwaffle
I know there is array_diffand array_udifffor comparing the difference between two arrays, but how would I do it with two arrays of objects?
我知道存在array_diff并且array_udiff用于比较两个数组之间的差异，但是我将如何处理两个对象数组？
array(4) {
[0]=>
object(stdClass)#32 (9) {
["id"]=>
string(3) "205"
["day_id"]=>
string(2) "12"
}
}
My arrays are like this one, I am interested to see the difference of two arrays based on IDs.
我的数组是这样的，我有兴趣查看基于 ID 的两个数组的差异。
回答by Jordan Running
This is exactly what array_udiffis for. Write a function that compares two objects the way you would like, then tell array_udiffto use that function. Something like this:
这正是array_udiff它的目的。编写一个函数，以您想要的方式比较两个对象，然后告诉array_udiff使用该函数。像这样的东西：
function compare_objects($obj_a, $obj_b) {
return $obj_a->id - $obj_b->id;
}
$diff = array_udiff($first_array, $second_array, 'compare_objects');
Or, if you're using PHP >= 5.3 you can just use an anonymous functioninstead of declaring a function:
或者，如果您使用 PHP >= 5.3，您可以只使用匿名函数而不是声明函数：
$diff = array_udiff($first_array, $second_array,
function ($obj_a, $obj_b) {
return $obj_a->id - $obj_b->id;
}
);
回答by megastruktur
And here is another option if you wanna compare string properties (e.g. name):
如果您想比较字符串属性（例如名称），这是另一种选择：
$diff = array_udiff($first_array, $second_array,
function ($obj_a, $obj_b) {
return strcmp($obj_a->name, $obj_b->name);
}
);
回答by patricksayshi
Here's another option, if you want to run the diff according to object instances. You would use this as your callback to array_udiff:
这是另一种选择，如果您想根据对象实例运行差异。您将使用它作为您的回调array_udiff：
function compare_objects($a, $b) {
return strcmp(spl_object_hash($a), spl_object_hash($b));
}
You'd only want to use that if you're certain that the arrays both contain only objects - here's my personal use case.
如果您确定数组都只包含对象，那么您只想使用它 -这是我的个人用例。
