PHP: Compare key value of objects - php

Question

I have two arrays each one contain a set of objects
$input = [
(object)[
'id' => 2,
'number' => 54523,
'date' => '2019-12-17',
'book_for' => 'tttt',
'subject' => 'tttt',
'content' => 'ttt',
'language' => 'Arabic',
'cpfor' => 'tt',
'book_key' => '2WHae',
'note' => 'ttt',
'type' => 'Internal',
'pid' => 2,
'bookid' => 2,
'process' => 'STA',
],
];
and the second array is
$answers = [
(object)[
'aid' => 1,
'a_number' => 0,
'answer_of' => 1,
'answer_date' => '2019-12-17 00:00:00',
'answer_for' => 'xcc',
'answer_subject' => 'DSF',
'answer_content' => 'FSD',
'language' => '',
'cpfor' => 'WE',
'note' => 'EWWE',
],
(object)[
'aid' => 2,
'a_number' => 0,
'answer_of' => 2,
'answer_date' => '2019-12-19 00:00:00',
'answer_for' => 'answer for tt',
'answer_subject' => 'answer for tt',
'answer_content' => 'answer for tt',
'language' => 'Arabic',
'cpfor' => 'answer for ttvv',
'note' => 'answer for tt',
],
];
I want looping through and compare the value of id key in first array with value of answer_of key in second array if the id is not the same answer_of then return this object else ignore in other mean if id is not exist in second array(answer_of) return the object with all key and values else ignore
i tried the below function but even get those are exist in second array
function unanswered2($array1, $array2)
{
if (!(empty($array2))) {
$unanswered_arrays = [];
foreach ($array1 as $b) {
foreach ($array2 as $a) {
if ($b->bookid != $a->answer_of) {
array_push($unanswered_arrays, (object)$b);
}
}
}
return $unanswered_arrays;
}
return $array1;
}
anyone can tell where i have an error or any suggestion
the result is
$result=unanswered2($input,$answers);
$result= [
(object)[
'id' => 2,
'number' => 54523,
'date' => '2019-12-17',
'book_for' => 'tttt',
'subject' => 'tttt',
'content' => 'ttt',
'language' => 'Arabic',
'cpfor' => 'tt',
'book_key' => '2WHae',
'note' => 'ttt',
'type' => 'Internal',
'pid' => 2,
'bookid' => 2,
'process' => 'STA',
],
];
it should ignore it not return

Answer 1

I think the simplest solution is to use array_filter and a prepared list of answer_of values (for which you can use array_column).
Here's an example:
function findUnanswered(array $questions, array $answers): array
{
// use array_column to prepare a list of `answer_of` values
// *array_flip* them, so we can later use isset for better performance
$availableAnswers = array_flip(array_column($answers, 'answer_of'));
// filter all questions
return array_filter(
$questions,
// by a callback function, that
static function (object $question) use($availableAnswers): bool {
// ^ which we *use* from the outer scope
// |
// checks if the question id is [not set]* in +
// (* meaning no answer exists)
return !isset($availableAnswers[$question->id]);
}
);
}
Demo: https://3v4l.org/ZKlNn

Answer 2

I've read your comment to the prev my answer...
function getDiff($ar1, $ar2){
return array_filter($ar2, function($obj) use ($ar1) {
foreach($ar1 as $obj1){
return $obj1->bookid !== $obj->answer_of;
}
}, ARRAY_FILTER_USE_BOTH);
}
print_r(getDiff($input,$answers));
Output:
Array
(
[0] => stdClass Object
(
[aid] => 1
[a_number] => 0
[answer_of] => 1
[answer_date] => 2019-12-17 00:00:00
[answer_for] => xcc
[answer_subject] => DSF
[answer_content] => FSD
[language] =>
[cpfor] => WE
[note] => EWWE
)
)
https://3v4l.org/oGQWS

Answer 3

Provided you don't care about the original keys in the answers array.
Input:
<?php
$input = [
(object)[
'id' => 2,
'number' => 54523,
'date' => '2019-12-17',
'book_for' => 'tttt',
'subject' => 'tttt',
'content' => 'ttt',
'language' => 'Arabic',
'cpfor' => 'tt',
'book_key' => '2WHae',
'note' => 'ttt',
'type' => 'Internal',
'pid' => 2,
'bookid' => 2,
'process' => 'STA',
],
];
$answers = [
(object)[
'aid' => 1,
'a_number' => 0,
'answer_of' => 1,
'answer_date' => '2019-12-17 00:00:00',
'answer_for' => 'xcc',
'answer_subject' => 'DSF',
'answer_content' => 'FSD',
'language' => '',
'cpfor' => 'WE',
'note' => 'EWWE',
],
(object)[
'aid' => 2,
'a_number' => 0,
'answer_of' => 2,
'answer_date' => '2019-12-19 00:00:00',
'answer_for' => 'answer for tt',
'answer_subject' => 'answer for tt',
'answer_content' => 'answer for tt',
'language' => 'Arabic',
'cpfor' => 'answer for ttvv',
'note' => 'answer for tt',
],
];
Method:
$unanswered = array_diff_key(
array_column($answers, null, 'answer_of'),
array_column($input, null, 'id')
);
var_export($unanswered);
Output:
array (
1 =>
stdClass::__set_state(array(
'aid' => 1,
'a_number' => 0,
'answer_of' => 1,
'answer_date' => '2019-12-17 00:00:00',
'answer_for' => 'xcc',
'answer_subject' => 'DSF',
'answer_content' => 'FSD',
'language' => '',
'cpfor' => 'WE',
'note' => 'EWWE',
)),
)